/usr/share/eccodes/definitions/mars/grib.enwh.pf.def is in libeccodes-data 2.6.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | alias mars.number = perturbationNumber;
alias mars.date = referenceDate;
alias mars.hdate = dataDate;
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