Nadir Microwave Spectra
*FLG section specifies
In the *SPC section the resolution of 0.005 GHz corresponds to just under 6000 points per cm-1. If you run the standard RFM with this you'll probably get an error message saying that MAXFIN is too small. Increase the MAXFIN parameter in rfmsiz.inc to 6000 and recompile the RFM.
As a rule, it is usually necessary to use much higher spectral resolutions for microwave calculations than in the infrared in order to capture the Doppler width of lines (which scale as frequency or wavenumber, unlike the Lorentz width which remains constant). However, you can usually reduce the MAXWID parameter in rfmsiz.inc to c.10 in order to keep the memory requirements down (there are large arrays dimensioned as MAXFIN x MAXWID).
*HDR 04JUL17 RFM Example: nadir microwave *FLG NAD SFC RJT GHZ VVW *SPC 50 70 0.005 *GAS O2 H2O *ATM ../atm/usa.atm *SEC 1.0 *HIT ../hit/hitran_2012.bin *END