/usr/share/eccodes/definitions/mars/grib.enda.ssd.def is in libeccodes-data 2.0.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | alias mars.instrument = instrumentType;
alias mars.ident = satelliteNumber;
alias mars.number = perturbationNumber;
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