XMM-Newton Science Analysis System
backscale (backscale-1.6) [xmmsas_20211130_0941-20.0.0]
To improve the execution time of the task the source region is divided into
a grid which is used to check whether pixels lie on a CCD.
The width of each grid element is set by default to be 40 detector pixels
( arcseconds). It has
been chosen like this to give reasonable coverage of CCD gaps
where they make a significant contribution to the total area while
keeping reasonable execution times for larger areas.
To improve the accuracy the resolution should be increased to e.g. 0.5
XMM-Newton SOC -- 2021-11-30