![]() The fitted circle, when com- bined with the position of the central source. ![]() ![]() It provides for easy communication with external analysis tasks and is highly configurable and extensible. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps. The program is free and has versions that should run on Windows, Mac OS, and Linux. using SAOIMAGE DS9 (Joye & Mandel 2003) in a similar fashion to in Fig. Therefor, when DS9 opens the image, it finds no valid data to display. SAOImage DS9 is an astronomical imaging and data visualization application. See the help page (and especially examples) for details. Using ds9 Well be using SAOImage ds9 to display and analyze Chandra data, so make sure that you can run it on your computer. window ds9 & this should start up the image display program SAOIMAGE ds9 IN XGTERM cl starts iraf, you will now see cl> prompt all iraf commands. The advantage is it works on the entire image, but you'll probably need to play with the scaling to get the same effect. you could save a colormapped GIF or a 24-bit Sun rasterfile). Zoom to fit an (already displayed) image then plot regions in ifu.reg xpaset -p ds9 zoom to fit cat ifu.reg xpaset ds9 regions -format ds9 display. tools (SAOImage DS9, GAIA, Aladin), table analysis tools (VisIVO, STILTS. All of the attributes, except the to fit one, take one or more arguments (see the DS9 documentation for what they are). It will allow you to apply functions such as sqrt to the pixels and weight various colors when creating an output image (e.g. If you want to specify only a single table, you can give a position indicator. You can contact Bill Joye to request adding this feature, but I don't think you can do it currently.An alternative to look at is the EXPORT task in the DATAIO package. The latter is equivalent to using TVMARK to read back the frame buffer and specifying an 'outimage' parameter in that the saved pixel values are the 0-200 colormap index values and there is no colormap information. AFAIK, ds9 provides a 'saveimage' XPA point that lets you save the visible part of the screen in a variety of formats, and a 'savefits' access point to save the entire frame buffer as a FITS file (however it flips the image when it does it).
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