SAOimage allows the interactive building of a spatial region that can be fed to other IRAF tasks (e.g., imcnts, see Features of PROS Software, Radial Profiles and Projections) to sum up counts etc. Bring up SAOimage using ximtool and display the ROSAT test image xdata$rp110590_iml.imh.
N.B.: If you are working with a blocked or sectioned image, the region will be created in the corresponding coordinates. If required, the original image coordinates can be restored using fixsaoreg).