Data Files Handbook
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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.
4.1.4 EPIC MOS diagnostics files
European Space Agency - XMM-Newton Science Operations Centre