/usr/share/eccodes/definitions/mars/grib.seas.fx.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 | alias mars.number = perturbationNumber;
alias mars.method = methodNumber;
if (class is "od") { alias mars.system = systemNumber; }
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