XMM-Newton Data Files Handbook

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4.1.4 EPIC MOS diagnostics files

For non-science mode observations, e.g., calibration observations, Diagnostic Mode Image Files files (files by name *M[1,2]*DII.FIT; see Table 1) are created that can not be found in standard ODF directories. The diagnostic files are binary images of Cal-closed observations without any correction (e.g., cosmic rays are not removed). They are equivalent to a dark-current observation and are used to produce the detector offset maps.

European Space Agency - XMM-Newton Science Operations Centre