XMM-Newton Science Analysis System
rgsoffsetcalc (rgsoffsetcalc-1.19) [xmmsas_20230412_1735-21.0.0]
![[*]](../icons/footnote.png)
- Light of stars outside the telescope field of view may reach
the RGS focal plane after reflections on the front side of the
gratings. Optical light may also be reflected on the back surface
of the gratings; before launch the exact magnitude of this effect is
not known. Regions around the pointing direction from which light
could be reflected on the RGS focal plane are called avoidance
fields.
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