SAS home . ... This thread contains a step-by-step recipe to extract MOS spectra of a point-like source observed in Imaging mode and to create the associated response matrices, starting from a calibrated, concatenated event list (either produced with emproc or available as PPS product; here it bears the file name MOS.evt ). The content of this thread is the same as the thread to extract MOS spectra for point-like sources (command-line version). ... NOTE ON PATTERN SELECTION IN MOS SPECTRA: . ...