These data files give collision-induced absorption for 
N2-N2, N2-CH4, CH4-CH4, and N2-H2.  The data was
computed from binary absorption coefficients given in

          Courtin R (1988) Icarus 75,245-254. 
          
Courtin's results are based on a combination of laboratory experiments and
simplified theory.  The main purpose of the paper was to provide coefficients
of use for Titan's atmosphere, which explains the emphasis on cold temperatures.
Further, the collision-induced absorption gets weaker with higher temperatures.
For giant planets, one would need the H2-H2 coefficients, which Courtin
doesn't give, and one would also want results at higher temperatures and
pressures.