Collisional parameters used by rotational water non-lte calculations.

Unit of the data is in per second per cubic meter.

The standard ARTS-way to read this data should be similar to how
lines and atmosphere are read, with all species of abs_species
existing in the same folder (as of 2019-02-21, the only supported
species is H2O)

Data is from H2O-H2O Collision Rate Coefficients by G. Buffa et al. The Astrophysical Journal Supplement Series, 128: 597-601, 2000 June