XMM-Newton Science Analysis System


epatplot (epatplot-1.22) [xmmsas_20230412_1735-21.0.0]

... set

e.g., event set with source region selected via evselect; if parameter withbackgroundset=Y (the default is “N”) an additional background event set is read in, and background subtracted pattern fractions are determined. Use parameter backscal to set the background-to-source extraction area ratio (default: 1.0). If exposure times of the source and background event set differ, the backscal parameter needs to be adjusted accordingly.

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... effects

For EPIC pn single events dominate the spectrum due to the relatively large pixel size of $150\mu$m. These have narrower line widths than doubles. Therefore most observers will choose singles (PATTERN==0). In the case of pattern pile-up you lose singles and gain doubles (and later triples etc).

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