Once your desired catalog (containing the positions of some objects) is created (for example, with MakeCatalog, Match, or Table) it often happens that you want to see your selected objects on an image for a feeling of the spatial properties of your objects. For example, you want to see their positions relative to each other.
In this section we describe a simple installed script that is provided within Gnuastro for converting your given columns to an SAO DS9 region file to help in this process. SAO DS9237 is one of the most common FITS image visualization tools in astronomy and is free software.
GNU Astronomy Utilities 0.22 manual, February 2024.