/usr/share/eccodes/definitions/mars/grib.lwwv.fc.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 4 | transient conceptDir = "mars";
concept waveDomain(unknown,"wave_domain.def",conceptDir,conceptDir) : no_copy,read_only;
alias mars.domain = waveDomain;
alias mars.anoffset=offsetToEndOf4DvarWindow;
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