RECOMMENDATION ITU-R P.676-5 - Attenuation by atmospheric gases
ANNEX 1 - Line-by-line calculation of gaseous attenuation
1 Specific attenuation
2 Path attenuation
    2.1 Terrestrial paths
    2.2 Slant paths
3 Dispersive effects
ANNEX 2 - Approximate estimation of gaseous attenuation in the frequency range 1-350 GHz
1 Specific attenuation
2 Path attenuation
    2.1 Terrestrial paths
    2.2 Slant paths
    2.3 Slant path water-vapour attenuation