Steps to create FISM nc file for TIE-GCM input:
1. cd ../RawData/FISM_flare/YYYY/
   ls *.sav > ../../../codes/files_YYYY.dat
   cd ../../../codes/
2. modify mkncfile_for_fism_flare_1.pro
   idl>.r mkncfile_for_fism_flare_1
output: YYYYDDD_DDD_fism_0_195nm_orig.dat
3. modify get_spectra.pro and tlsm.pro
   get_spectra: L121, L405
   tlsm: L227
   idl>.r tlsm
output: flux_37.dat
4. modify mkncfile_for_fism_flare_2.pro
   idl>.r mkncfile_for_fism_flare_2
output:YYYYDDD_DDD_fism_0_195nm_37.nc