XMM-Newton Science Analysis System
omfchain (omfchain-1.43.1) [xmmsas_20211130_0941-20.0.0]
Fast mode data is taken in a single format, arriving as an event list. In a
given exposure up to two Fast mode windows may be defined, each giving rise to
a separate event list. One should be aware that the Fast mode data are usually
accompanied by Image-mode windows from the same exposure which could be used
for more accurate determination of the background level (especially when
the target source is bright).
XMM-Newton SOC -- 2021-11-30
