XMM-Newton Science Analysis System
omfchain (omfchain-1.42.6) [xmmsas_20160201_1833-15.0.0]
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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/SSC -- 2016-02-01