GNU Astronomy Utilities

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B.1 SAO ds9

SAO ds9221 is not a requirement of Gnuastro, it is a FITS image viewer. So to check your inputs and outputs, it is one of the best options. Like the other packages, it might already be available in your distribution’s repositories. It is already pre-compiled in the download section of its webpage. Once you download it you can unpack and install (move it to a system recognized directory) with the following commands (x.x.x is the version number):

$ tar xf ds9.linux64.x.x.x.tar.gz
$ sudo mv ds9 /usr/local/bin

Once you run it, there might be a complaint about the Xss library, which you can find in your distribution package management system. You might also get an XPA related error. In this case, you have to add the following line to your ~/.bashrc and ~/.profile file (you will have to log out and back in again for the latter):

export XPA_METHOD=local