The angular size of the SXT full-resolution pixel was determined from
pre-launch focal length measurements to be 2.45280 arc sec for the X-ray
telescope. Half- and quarter-resolution images are twice and four times
this value, respectively. A routine to provide this number is
GT_PIX_SIZE which is called as:
IDL> print,gt_pix_size()
IDL> print,gt_pix_size(index)
If the SXT index or roadmap is passed in, the routine will return the
appropriate pixel size in arc sec for the resolution of the data. The
pixel size of the optical images is thought to be within 1% of the
X-ray pixel size.