Example for the speed of the ROSAT all-sky survey scanning as a function of time before and after a scan reversal. The alternating spreads correspond to a positional offset in scan direction of + 3.14″ and −3.14″ or a time delay between the photons in the RASS-2 and RASS-3 processing of 14.3 ms. The dashed red lines indicate time intervals when photons have been collected.
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