SPCONVOL convolves a spatial response which has been created by SPRESP with a user supplied source model. The idea is that the resulting modified response can be used for source detection or parameterisation which is targeted to find a particular intrinsic source surface brightness distribution.
The source model can be any 2 or 3 dimensional binned dataset, provided the number of spatial bins is odd in both X and Y, and that a third energy dimension (if it exists) matches that in the spatial response.