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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.