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Up to 700 Mbits of data (scientific, attitude, and housekeeping data from both the XRT and WFC) can be stored on the two on board tape recorders, and transmitted to the ground during ground station contacts. All necessary telecommands for S/C operations for one day must be loaded during the five or six consecutive GSOC contact orbits. At any given time, at most pointing positions can be stored by the system. Thus a large number of very short duration observations cannot be performed.