... arfgen (arfgen-1.54.7) [xmmsas_20030110_1802-5.4.1] . ... The spectrum is usually accumulated by the user over a specific region or regions in space. In order for the ARF generated to be appropriate for that region or regions, arfgen extracts spatial information from the Data Sub-Space (DSS) stored in the spectral dataset (see the dsslib documentation for more information regarding the DSS). This task uses the regions to calculate the spatially dependent elements of the ARF. ...