The point spread function (PSF) of the SXT has a narrow core and wide
scattering wings. Laboratory measurements of the core of the PSF have been
analyzed thoroughly by Martens (SXT Calibration Note 34). The shape of the
PSF is well characterized by an elliptical Moffat function with a FWHM of
about 1.5 CCD pixels (3.7 arcsec) over the central area (diameter = 470
pixels or 2300 arcsec) of the CCD. Between a radius of 1 and 10 CCD pixels the slope
of the PSF falls off roughly as a power law of index 
.
There is as yet no released software for deconvolution of SXT images, although McTiernan has done some work on this using the maximum entropy method and Roumeliotis has used a modified Lucy method.