====== Creation of a radial brightness profile ======
The program ds9 can be used to create a radial brightness profile. In the following two possibilities will be described: 

===== Projection tool =====
  - Open the FITS file 
  - Click on ''projection tool'' in //Region > Shape > Projection// 
  - Mark the line at which the radial profile shall be created
  - In the popup window ''projection'' save the profile either as data table via //File > Save Data// as a *.dat file or alternative export the radial profile from the diagram window as a PostScript image via //File > Postscript Print//
  - Use gnuplot, tikz, pgfplots, WRplot, or alike (Excel would work, too) to create the profile

===== Line =====
  - Open the FITS file
  - Click on ''line'' in //Region > Shape//
  - Mark the line at which the radial profile shall be created
  - Double-click on the line
  - In the popup window create the profile via //Analysis > 2D Plot// 
  - In the popup window ''projection'' save the profile either as data table via //File > Save Data// as a *.dat file or alternative export the radial profile from the diagram window as a PostScript image via //File > Postscript Print//
  - Use gnuplot, tikz, pgfplots, WRplot, or alike (Excel would work, too) to create the profile