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The on-board storage rate for
detected events (i.e. photons or background particles) is normally
restricted to 200 counts s 
; this corresponds to filling the entire
WFC allocation of the on-board tape-recorder in 24 hours, but there is a high
data rate of 400 counts s
which can be used for limited periods, for example to take
advantage of the storage allocation not used during intervals when the detector
is switched off (e.g. during radiation belt transits). The WFC is configured to
automatically switch to this high speed mode during high count rate intervals.