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Description SAOImage DS9 is an astronomical imaging and data visualization application. Can be used with IRAF.
Version installed Fedora-26: 7.5 (installed in January 2017).
Usage At the command prompt, type:

Do not start DS9 from inside IRAF. Start it before you start IRAF, or from another terminal.
Upgrade Notes A detailed list of all changes and improvements is available at the DS9 version 7 Release Notes page.
Manuals and
Use the "help" button in the DS9 window, see the Reference Manual and read the FAQ.
SIE contact Nicola Caon - - tel: 5383 - office: 1.124
Additional Info DS9 is also available for Windows, but you will have to install it yourself.

Note for IRAF users:
"Due to the unique relationship between DS9 and IRAF, if you use the imexamine task, you can take advantage of a special feature of DS9. Instead of loading the image from IRAF with the display task, load the image directly into DS9. Then, from the cl prompt, invoke imexamine without a filename. IRAF will ask DS9 for the current filename and use it for analysis. This approach provides serveral advantages over previous methods. First, it will work with compound fits images such as mosaics, data cubes, and rgb images. Second, the image display includes true image data and WCS information, not the approximated data from IRAF."