NRCO 54: The RGS response to the Crab X-ray standard

As a calibration source for the RGS, the Crab has notable advantages. Itprovides a smooth and stable continuum spectrum that, under properly controlledconditions, illuminates all CCDs in either 1st or 2nd order with a strongconstant signal. Inspection of the Crab data obtained so far during the missionhas shown that the instrument.s response has been reasonably stable althoughextra measurements are required to understand the data properly because of theextreme conditions under which the RGS has to work for a source of thisexceptional brightness. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]