GAIA – Graphical Astronomy and Image Analysis Tool
Contents
1. If you prefer to point at the image and text entry fields before using the keyboard rather than having to click in them first then use the command gaia image_name focus_follows_mouse 1 Some additional configuration options are only available using environment variables The most useful of these is the GAIA_TEMP_DIR variable that defines a directory that will be used for writing most temporary files The default is to write these into the current directory which can be a problem when working on read only data 4 1 Proxy servers Access to the World Wide Web may be restricted by a firewall or maybe just site policy so that it is only available through a web cache or proxy server If you are in this situation you ll need to configure GAIA so that its remote catalogue access will work To do this start up GAIA select the Data Servers menu and choose any remote catalogue Now in the catalogue window select the Options menu and choose the Proxies item Now fill in the two fields consult your system administrator if you re unclear what to enter here and press OK 4 2 Add new colour and intensity maps The default set of colour and intensity maps used in GAIA can be extended by adding new ones to the skycat colormaps directory Colour maps are simple text files with three columns each column represents the Red Greed and Blue fractions for values in the range 0 to 255 so the file should have 256 rows and three col2. GAIA is a derivative of the SkyCat image display and catalogue browsing tool developed as part of the VLT project at ESO Both SkyCat and GAIA are free software under the terms of the GNU copyright The 3D facilities in GAIA use the library 2 Getting Started The following two sections describe the absolute basics of how to startup GAIA and how to display images using it If you need help beyond this and are new to GAIA then you should probably read the The GAIA CookBook SC 17 In addition to the usual introductory text this also contains several recipes for achieving specific tasks such as measuring instrumental magnitudes and making use of celestial coordinate information although at the time of writing the astrometric calibration sections are now out of date with the arrival of the new toolboxes based on AUTOASTROM The other main source of information about GAIA is the on line help system This can be accessed after starting GAIA just select the Help menus Many windows also feature short help This is a retangular region at the bottom of a window that may display a one line description of the window element under the cursor an approximation of balloon help If you need help beyond what is available in these resources or have any suggestions for improvements then join the Starlink user support mailing lists at Thttp archive eso org skycat http www eso org vlt 3http www eso org SUN 214
3. conversion facilities of the NDF library which it uses directly This on the fly conversion uses external programs that can convert your data from its current format into an NDF and then back again if necessary The CONVERT SUN 55 package provides many formats that are useful for astronomers e g FITS IRAF and old FIGARO formats and is automatically used by GAIA unless you have set up your own conversion facilities see SSN 20 if you think you need to do this All the formats recognised at any time by GAIA are shown in a menu in the file chooser so check this to see if your format is available FITS files are a special case in that GAIA will read these natively which gains increased efficiency however any external analysis routines such as those used in the photometry toolbox will still need to be able to convert these files into NDFs using the on the fly facility so if you define your own conversion facilities make sure that you include a FITS converter note these doesn t apply to FITS data cubes GAIA handles converting these into NDFs for the various toolboxes directly To display any of these images in GAIA just type the full disk file name on the command line either when you start GAIA or by using the gaiadisp command or similarly select the disk file in the open file window To display a FITS file extension image either open the disk file and choose the extension from the HDU selector window that appears or add t
4. Show milliarcsecond readout precision Detach the control panel Image and entry focus follows mouse pointer Display decimal degrees in main window readout A scale for non pixel display fonts A geometry for the main window A string to add to the window titles Reveal the Interop menu for SAMP interactions Colour for the background of the main image Search box for centroiding 9 Assume CAR projections are a linear mapping Maximum shift when centroiding 5 5 Default scale factor used in pick object window Display NDF pixel indices as X Y Issue a warning before exiting GAIA 0 Automatically show the HDU chooser Make toolboxes transient Make spectral plot window transient X visual pseudocolor truecolor visual id Display a colour ramp Display a pan window Display a zoom window SUN 214 44 Configuration options 12 The full list of options can be seen using the help option So for instance if you wanted to float the control panel useful for smaller displays and have a grey default colourmap Then start using the command gaia image_name default_cmap ramp float_panel 1 Or alternatively to save some space without floating the panel try gaia image_name with_zoom_window O with_pan_window 0 1 means true and 0 false If you d like the toolboxes to remain on top of the display window they are associated with then set the transient_tools option to 1 the precise behaviour you get depends on your window manager
5. and replace them with a surface fit to other regions together with an artificial noise component An ideal way to remove unwanted defects from an image for cosmetic reasons Interactive ARD SUN 183 regions This allows the calculation of statistics the masking out and extraction of arbitrary shaped parts of your images as well defining ARD regions for other programs to use Contouring This allows the contouring of the displayed image or the overlay of contours derived from other images The images are aligned using sky coordinates if available Control over individual line colours and thicknesses is provided Polarization vector plotting and manipulation This provides the ability to display vector maps produced by the POLPACK SUN 223 package It also allows you to select sub sets of vectors either by algebraic expressions or by rectangular regions Selected parts can be removed or saved to new catalogues New vector maps can be created by binning vectors and reports of the properties of selections can be displayed 5 SUN 214 44 What does it actually do Blink comparison All the displayed images can be animated as quickly as your hard ware CPU combination allow or you can cycle through them by hand Interactive position marking Mark and label positions on your images and print or record them for future reference This also allows positions to be read in from text files and input sky coordinates to be transformed to different
6. tion as well as allowing the comparison of two regions Image analysis capabilities GAIA provides the following features which are specifically aimed at astronomical work with images Aperture amp optimal photometry A highly interactive environment for controlling the positions sizes and orientations of circular and elliptical apertures The sky estimates can be made from annuli of these apertures or from related sky apertures The measurements can be in either instrumental magnitudes or mean counts based on the PHOTOM SUN 45 program AUTOPHOTOM Automatic source detection This feature provides the ability to automatically detect and parameterise all the objects on an image These objects are then identified by displaying ellipses over the image and are available for interactive inspection The resultant measure ments are displayed in a catalogue window which can be used to inspect the individual values select data on the bases of range limits and change the appearance of the ellipses This is based on the EXTRACTOR package a derivative of SExtractor Extended surface photometry This allows the interactive identification of extended objects galaxies and profile measurements using ellipse fitting The resultant fits are shown over the images and the measurements can be inspected based on the ESP SUN 180 programs ELLPRO and ELLFOU Image patching This provides the ability to select arbitrary shaped regions on an image
7. 44 Getting Started 2 http www starlink ac uk The GAIA home page is at http www starlink ac uk gaia which may be updated from time to time GAIA is available for download as part of JAC Starlink Release at 2 1 Using GAIA from the C shell To display an image in GAIA use the following command assuming that you are already initialized to use Starlink software gaia image_name Alternatively you can use the File menu to load an image If you want to display an image in an existing GAIA then use the invocation gaiadisp image_name You can also write to a specific window using the clone number gaiadisp image_name 2 This displays into the window with title GAIA SkyCat 2 If this window doesn t exist it will be created A list of images can be displayed in GAIA using the command gaiadisp image_namel image_name2 image_name3 These will be displayed in separate clones Finally percentile or data cuts can be applied using the p option or 1 and h options gaiadisp p 98 image_name1 image_name2 image_name3 gaiadisp 1 100 h 200 image_name1 image_name2 image_name3 works for the single image case too 3 SUN 214 44 What does it actually do 3 What does it actually do The capabilities of GAIA fall roughly into three areas those of an image and cube display tool those provided for the analysis of images and cubes amd those for querying on line resources images and catalogue d
8. TAB gt DEC lt TAB gt MAG OBJ1i lt TAB gt 210 00 lt TAB gt 54 00 lt TAB gt 16 1 OBJ2 lt TAB gt 210 01 lt TAB gt 54 01 lt TAB gt 15 1 The usual format of a catalogue is as above i e an object identifier followed by an RA and DEC in J2000 decimal degrees Note the lt TAB gt strings shouldn t be typed in they are shown explicitly just to make clear where they should be placed The TST format is also recognised by the TOPCAT and CURSA packages SUN 190 CURSA also contains a description of this format Shttp simbad u strasbg fr simbad http arch http hq eso org dss dss 7http adswww harvard edu Shttp cadcwww dao nrc ca hst http www starlink ac uk topcat 7 SUN 214 44 What does it actually do Additional formats that can be also read and written by GAIA with a performance penalty are those supported by the CURSA package i e FITS tables and STL format and the ASCII_HEAD format of the SExtractor EXTRACTOR package SUN 226 as well as the XML VOTabl format The format that is used to open or write a catalogue is determined by the file extension e FITS tables accepted file types FIT fit FITS fits GSC gsc e STL accepted file types TXT txt e ASCII_HEAD accepted file types asc ASC lis LIS e VOTable accepted file types xml XML vot VOT All other file extensions are assumed to indicate a TST the preferred extensions for these are tab or TAB 3 4 2 Us
9. celestial coordinate systems Mean seeing and shape parameters of any marked stars are also available as part of this analysis Celestial coordinates readout If your data have suitable astrometric calibration data available in recognised headers i e FITS IRAF or NDF WCS then a continuous readout of the current RA and Dec is provided e Astrometric calibration You can either fit a new astrometric calibration to your image using semi automated matching between detected images and on line catalogues or you can define your own reference positions set one using known information such the image scale and a reference point copy one from another image and finally tweak one to make it fit better e Astrometric grid overlay If you can read out sky coordinates then you can also plot a grid overlay with labelled axes The grid facility is provided with an enormous range of customization options such as being able to change the celestial coordinate system from say FK5 to Galactic etc Celestial coordinate system control You can change the celestial coordinate system used by your image to a new one to from FK5 FK4 Ecliptic Geocentric apparent Galactic and SuperGalactic e Sky coordinate offsets This feature also relies on being able to read celestial coordinates if so then you can determine the distance and offsets between any two points on your image in arc minutes Real time profiling Two separate toolboxes allow you to either
10. the project and much documentation is available about the internals of how SkyCat and consequently GAIA are constructed If you are interested in finding out about these then consult the postscript documents which you can find from links on the SkyCat homepage The documents relevant to the version of SkyCat that GAIA is based on are also available at People who would like to extend SkyCat or GAIA at the user interface level are recommended to read about SkyCat plugins 7 Acknowledgements Many thanks go to Allan Brighton Thomas Herlin Miguel Albrecht Daniel Durand and Peter Biereichel who are responsible for the SkyCat developments at ESO in particular for making their software free for general use GAIA and SkyCat are both based on the scripting language Tcl TK developed by John Ousterhout and the incr TelfJobject oriented extensions developed by Michael McLennan They also make use of many other extensions and scripts developed by the Tcl community Thanks are also due to the many people who helped test out GAIA and iron out minor and major problems in particular Tim Jenness Tim Gledhill and Nigel Metcalfe and all the users who have reported bugs and sent support since the early releases and continue to do so The 3D facilities of GAIA make extensive use of the library Also a free library GAIA was created by the now closed Starlink UK project funded by the Particle Physics and Astronomy Research Council PPARC and
11. 99 at 10 24 04 id col 0 x cols 1 ycols 2 10http www ivoa net cgi bin twiki bin view IVOA IvoaVOTable SUN 214 44 What does it actually do 8 symbol ID LENGTH ANGLE line ANGLE 27 0 3 LENGTH O 1 ID lt TAB gt XPOS lt TAB gt YPOS lt TAB gt LENGTH lt TAB gt ANGLE ID 1 lt TAB gt 206 000 lt TAB gt 189 000 lt TAB gt 6 32528 lt TAB gt 104 816 ID 2 lt TAB gt 209 000 lt TAB gt 189 000 lt TAB gt 5 86891 lt TAB gt 109 238 The x_col and y_col parameters indicate the columns of the data that correspond to the X and Y positions and the symbol parameter how to plot a line centered on that position In this case the statements says extract values for the ID LENGTH and ANGLE columns then draw lines with position angle ANGLE 27 and length LENGTH 0 1 pixels Note that a dollar sign is used to prefix column names in these expressions in fact these expressions will be parsed by the Tcl expr command with the column values set to a variable with the same name as the column for each line in the table Creating such a symbol parameter is best done by using the special Set Plot Symbols window available under the local catalogue menu Options Using this window you can plot multiple symbols per object specify which column to use as labels change the graphic colour etc Now if you look in the file skycat skycat cfg after setting up your options a suitable symbol parameter is recorded tog
12. SUN 214 44 Starlink Project Starlink User Note 214 44 Peter W Draper Norman Gray David S Berry amp Mark Taylor 16th January 2014 GAIA Graphical Astronomy and Image Analysis Tool 4 4 4 User s Manual Starlink GAIA Skycat m51_opt sdf 1 2 dss26103 file m51_opt sdf 139 0 Y 238 0 13 29 59 824 8 47 13 28 22 139800 j7 High 13974 3 Color Map EEE Max Declination Right ascension E image select object 9 scroll image 2 measure WCS Control M select region SUN 214 44 Abstract ii GAIA is an image and data cube display and analysis tool for astronomy It provides the usual facilities of image display tools plus more astronomically useful ones such as aperture amp optimal photometry contouring source detection surface photometry arbitrary region analysis celestial coordinate readout calibration and modification grid overlays blink comparison defect patching and the ability to query on line catalogues and image servers It can also display slices from data cubes extract and visualise spectra as well as perform full 3D rendering iii Contents 1 Introduction 2 Getting Started 2 1 Using GAIA from the C shell 3 4 3 FITS tables 3 7 SAMP interoperability 4 Configuration options 4 1 Proxy servers 4 2 Add new colour and intensity m
13. aps 5 GAIA demonstration Finding out more about SkyCat 7 Acknowledgements SUN 214 44 Contents 10 12 12 13 13 13 1 SUN 214 44 Getting Started 1 Introduction GAIA is an highly interactive image display tool but with the additional capability of being extendable to integrate other programs and to manipulate and display data cubes At present im age analysis extensions are provided that cover the astronomically interesting areas of aperture amp optimal photometry automatic source detection surface photometry contouring arbitrary region analysis celestial coordinate readout calibration and modification grid overlays blink comparison image defect patching polarization vector plotting and the ability to connect to resources available in Virtual Observatory catalogues and image archives as well as the older Skycat formats GAIA also features tools for interactively displaying image planes from data cubes and plotting spectra extracted from the third dimension It can also display 3D visualisations of data cubes using iso surfaces and volume rendering Specialised handling of data from the CUPID package provides the visualisation of clumps of emission in 2D and 3D as ellipses polygons and boxes Interoperability with other SAMP enabled applications is provided so that GAIA can be used as part of a integrated desktop usually querying the Virtual Observatory
14. ata held in the VO and other places Each of these areas is described very briefly in the next sections As with most graphical tools probably the best way to find out about GAIA is to explore it interactively Failing that many windows have a one page description in the on line help system and most graphical elements buttons entry fields etc have one line descriptions that appear in the short help region at the bottom of windows Windows that provide a limited range of controls for some kind of focussed task are called toolboxes In general what they do should be obvious or they are really front ends for other software packages Good examples of this latter type are the photometry and object detection toolboxes When such a toolbox is used the documentation for the command line tools is the primary source for finding out what is going on under the bonnet 3 1 Image display capabilities GAIA provides the following normal image display tool features Display of images in FITS and Starlink formats this also means that it will display many other data formats using the on the fly data conversion ability of the NDF library most notably the IRAF data format e Panning zooming data range and colour table manipulations e Continuous display of the cursor position and the image data value Display of many images clones each in its own window Coloured annotation using text and line graphics boxes circles polygons lines w
15. ether which the description for your local catalogue which you can then edit into your tab files To find out more about the TST format and how to configure plot symbols you should consult the ESO document Astronomical Catalog Library and Writing Catalogue and Image Servers for GAIA and CURSA SSN 75 3 4 3 FITS tables Much of the above also applies to FITS tables that GAIA will read i e FITS keywords with the name SYMBOL will be interpreted correctly Special parameter names that are longer than 8 characters such as search_cols sort_order show_cols and copyright should be truncated Long symbol expressions can span more than one card by using the names SYMBOL1 through SYMBOLY The columns used for world coordinates should have units of degrees or radians and have names like RA and DEC 3 5 CUPID catalogues and masks Catalogues produced by the CUPID application can be displayed in 2D or 3D and it s masks can be displayed or used to view regions To display a 2D catalogue just open it as a local catalogue or import it using the Import CUPID catalogue toolbox in the Image Analysis positions menu This latter option allows you to select which columns to use as RA and Dec and whether to use the special Shape column as the plotting symbol STC S ellipses and polygons are supported If you choose not to use the STC S shapes then boxes based on the extents will be displayed Displaying 3D catalogues should be done by imp
16. has been more recently supported by the Joint Astronomy Centre Hawaii funded again by PPARC and more recently by its successor organisation the Science and Technology Facilities Council STFC 1Shttp archive eso org skycat 1http tcl activestate com http www tcltk com
17. he extension number to the disk file name gaia mef_file fits 2 The FITS primary array is number 1 A similar mechanism exists for NDFs stored in container files at other than the top level gaia hdscontainer ndf_1 In this case any other NDFs stored at the same level in the container file will also be shown in a selector window NDF slices can also be used SUN 214 44 Configuration options 10 gaia hdscontainer ndf_1 200 500 100 700 This can also be applied to FITS files and other foreign formats but note that this means that FITS files will now be accessed as foreign i e the FITS files will really be NDFs gaia file fits 300 700 300 700 3 7 SAMP interoperability SAMP stands for Simple Application Messaging Protocol It is a protocol which allows tools on the desktop to communicate with each other Very briefly the way it works is that applications can send messages to a central hub process which will then pass them on to other applications which can respond to them in some appropriate way GAIA can use SAMP to send and receive images sky position information and catalogues or identification of rows within them It can also send extracted spectra You will require a hub either free standing or integral to some other application to use these capabilities You can find more information about how it works what applications are compatible and how it can be useful at the SAMF web page To rem
18. ing your own local catalogues If you have a simple text file containing columns of positions then the most straight forward way to plot them in GAIA is by using the Select Positions toolbox This accepts as do the various astrometry toolboxes a file containing the following values ID RA DEC X Y in that order e g 1 00 19 49 47 00 0712559 854 50 2 00 20 06 71 00 06 05 3 240 244 3 00 19 47 54 00 04 23 2 925 484 4 00 19 58 07 00 04 49 1 549 424 5 00 19 48 69 00 06 59 0 882 114 The columns should be space separated and the celestial coordinates should be in decimal degrees or sexagesimal format as shown above More complex files can be imported into this toolbox using its Import text file option this allows fixed column widths or other separators If you need to import such a file into a catalogue window this is the sort of window that queries to on line catalogues are shown in and provide extra facilities like applying intensity cuts etc then use the Import plain text file toolbox from the Positions menu You can also create your own local catalogues in TST format This allows you to describe how to plot the catalogue For instance if you wanted to plot position vectors as correctly orientated lines over an image you would need a tab table that contained the following sort of information again note that the lt TAB gt string should be replace by a single tab character File created by pwd on June 15 19
19. ith arrowheads ellipses Printing of the displayed image and annotations annotations are drawn using printer resolution i e not a screen dump to a postscript file Real time pixel value table A table displaying the data values and simple statistics of a region about the cursor can be displayed Display of image planes and spectra from data cubes Using this you can step along an axis and display the image formed by the other two axes You can also combine a range of image planes or do the stepping using a timed animation The displayed images created by this tool can be analysed in the image analysis toolboxes A spectrum from the hidden dimension of the cube can be displayed and updated interactively and even sent to the Starlink SPLAT VO program for analysis and additional inspection Finally the spectral coordinates can be interactively transformed between various wavelength frequency energy and velocity systems SUN 214 44 What does it actually do 4 3 2 Selection of 2D or 3D regions using an integer mask If you have a mask that segments your image into regions based on some integer value you can view only those parts of your image that correspond to some given values Such masks are produced by the EXTRACTOR SExtractor and CUPID applications Histograms of the pixel distribution in rectangular regions of the displayed image This also shows parabolic and gaussian fits to the distribution mainly for background estima
20. liography links to the ADY abstract service Finally the HSTP archives are also available Using these you can see what observations have been made of any objects on your image and preview any generally available More recently GAIA has been extended to offer similar features catalogue and image access using the developing Virtual Observatory These like the features above are found in the Data Servers menu of the main window Note you should take time to find what your obligations in terms of the correct acknowledge ment of copyright use of service etc are whenever you use facilities such as those mentioned above 3 4 Local catalogues GAIA allows you to save remote catalogue queries to a local file These can then be re loaded and plotted as if on line catalogues This is very useful if you need to re plot catalogues but equally useful is the fact that local catalogues may be modified So you can edit sort select and delete records using a tool like TOPCAT Jor a simple editor if the facilities GAIA offers are not sufficient 3 4 1 Catalogue formats Local catalogues may be stored in several formats The native version is called a tab separated table TST This is a simple text file in which the values of the various fields are separated by a single lt TAB gt character and the catalogue headers are separated from these by a dashed line comment keywordi valuel keyword2 value2 ID lt TAB gt RA lt
21. move a line around on the image and see the image data values displayed as a profile change this profile can also be saved as a spectrum or do the same with a rectangle in which case the mean profiles along the X and Y directions are shown e Object parameterization This allows you to select a single object on the image Details such as its full width half maximum peak intensity etc will be shown These values are based on a 2D gaussian fit e STC S regions STC S region outlines often used to define footprints of various kinds can be drawn 3 3 On line catalogue capabilities Using the facilities provided by SkyCat GAIA is capable of downloading images from several surveys and catalogues from a wide range of sources so for instance if your image has a world coordinate system associated with it you can query the ESO catalogue of HST guide stars about any located within the bounds of your image These will then be listed and plotted over your image Similarly you can query the NASA IPAC Extragalactic Database and http nedwww ipac caltech edu SUN 214 44 What does it actually do 6 SIMBAD databases and see lists of all the objects that they know about on your image You can also display an image returned directly from the Digital Sky Survesftand then perform queries in other catalogues about this field Named objects from certain catalogues can have their full information displayed in a web browser and may even have bib
22. orting them using the cube toolbox View Import CUPID catalogue When imported this way only regions that are in the current slice will be displayed Note that if opened as a 2D catalogue all the regions will be displayed 3D http astro dur ac uk pdraper gaia docs cat ps gz 9 SUN 214 44 What does it actually do catalogues can also be viewed in a 3D scene as prisms just select one of the 3D renderers in the View menu in the cube toolbox and click on the CUPID tab and select Display catalogues You can restrict the regions displayed to rows selected in the associated catalogue window by selecting Only show selected rows To use a 2D mask open it using the Mask image toolbox in the Image Analysis menu This can then be applied to the displayed image and individual or ranges of regions can be selected for display To use a 3D mask look in the CUPID tab in the 3D rendering window and select your mask in the Mask entry To just display the mask select Display and press Draw To view individual regions or a range enter some values into Values To apply these regions to the main cube and select the original flux you need to select Apply mask and probably select Display of the mask itself although you can display both together in that case you may want to change the opacity 3 6 Accessing images of differing formats GAIA can display and perform analyses on many different data formats It does this by using the on the fly
23. ove the Interop menu you can use the Startup options window located in the File menu SAMP is an evolution of the earlier similar protocol PLASTIC PLASTIC support which was provided in earlier versions of GAIA has now been withdrawn in favour of SAMP 4 Configuration options GAIA has many options that can be defined when starting it up These are best set using the Startup options window located in the File menu but you also define these on the command line http www ivoa net samp 13http plastic sourceforge net 11 SUN 214 44 Configuration options option Meaning autoscale Auto scale image to fit window disables zoom autofit Auto fit new images to window always_merge blank_color catalog check_for_cubes component component default_cmap demo_mode extended_precision float_panel focus_follows_mouse force_degrees font_scale geometry ident interop_menu image_background isize linear_cartesian maxshift pick_zoom_factor pixel_indices quiet_exit show_hdu_chooser transient_tools transient_spectralplot visual with_colorramp with_pan_window with_zoom_window Merge primary and extension headers Colour for blank pixels Open windows for the given catalogs on startup Check input files to see if they are cubes 1 NDF component to display on startup The NDF component data variance or quality Change the default colour map Make the demo toolbox available
24. umns of values in the range 0 to 1 Intensity maps should also be in this format but just have one column with values in the range 0 to 1 Finally colour maps should have the file extension lasc and intensity maps iasc The basename of the files should be unique and not match those of any existing colour and intensity maps if they do so then the existing maps will be superceded The maps themselves can only be found in the View menu window Colors l4Even if you don t have transient_tools set window managers can still cause many perceived problems dealing with toolboxes Make sure that you have autoraise and autoraise on first focus type options switched off if you feel that toolboxes and dialogs unnecessarily take charge of things like the focus 13 SUN 214 44 Acknowledgements 5 GAIA demonstration Rather than just absorbing the rather dry descriptions above you can see some of GAIA facilities in action in a special demonstration mode To activate this set your current working directory to an empty one with several megabytes of space free Now select the item Demonstration mode under the Image Analysis menu and answer yes when a dialog window offering to unpack the demonstration files appears After a while a toolbox window will reveal itself just press the Start button to see the demo Note that the demonstration contains flashing images 6 Finding out more about SkyCat SkyCat was developed at as part of
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