/usr/share/eccodes/definitions/grib1/precision.table 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 5 6 | # CODE TABLE 5.7, Precision of floating-point numbers
1 32bits IEEE 32-bit
2 64bits IEEE 64-bit
3 128bits IEEE 128-bit
255 255 Missing
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