.cia files can be downloaded from the
HITRAN web-site.
If a filename template DEFCIA is supplied, identified by
containing a '*' character,
first all the explicitly
specified files are read,
then '*' character in the template is
expanded to all
possible combinations of the molecules specified in the
*GAS section, as well as 'Air'. But if you
have both 'Air' and a specific molecule specified as broadening gases for
a particular spectral range, the RFM will return a fatal error message
(as you would expect).
When looking for filenames, molecule names are mixed case, although in practice
for most molecules represented by CIA files this is the same as upper case
(eg 'H2O', 'CH4'), apart from 'He' and 'Air'.
The order of molecules, eg O2-CO2 or CO2-O2, is not significant.
Using the wildcard, both combinations are checked.
Example
*CIA
../rfm_files/N2-N2_2011.cia ! CIA data for N2-N2
../rfm_files/*_2011.cia ! Other data, eg N2-CH4, O2-N2
