...mode

The counting mode is activated when the count rate in a quadrant exceeds the telemetry limit ( ${\sim} 400$ count s^-1 for the PN). In this mode, the information for individual events of that quadrant are not transmitted to ground.

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...level

See page 9 of http://xmm.vilspa.esa.es/docs/documents/CAL-TN-0018-2-4.pdf

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