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In a coordinated observation the ROSAT satellite will be pointed in a specified pointing direction during the time interval between ``Start Time (in UT)'' and ``Stop Time (in UT)'' in the Constraints Form. It is very important for guest observers to realise in general that during such a specified time interval data gaps will occur during the times of radiation belt crossings and earth occultations. The latter intervals may be used to schedule other unrelated observations. Specifically, it can not be guaranteed that a given target is observable at any specific time (see § 7.5 ).