/usr/share/eccodes/definitions/grib1/13.table 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 | # CODE TABLE 13, matrix coordinates parameter
1 1 Direction
2 2 Frequency
3 3 Radial number
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