MIPAS Initial Guess (climatology) data created by J.Remedios, U.Le.

The data are split into 4 `seasons' (Jan, Apr, Jul, Oct) and 6 Latitude bands
(1=90S:65S, 2=65S:20S, 3=20S:EQU, 4=EQU:20N, 5=20N:65N, 6=65N:90N).

ig.tar
  Contains the original ESA IG datafiles. Expands to 4 directories /january,
  /april, /july and /october, each containing files with names IG_[GAS].DAT
  where [GAS]=TEM, PRE, or molecules name (all upper case, using F... codes for
  CFCs). Note that there is no distinction in the file names for the different
  months, hence the need for separate directories.

ig.atm.tar 
  Contains MIPAS IG profiles for all species combined into .atm files suitable
  for input into MORSE via the *CLI section of the driver table. Expands into a
  series of files with names IG_profiles_lat[n]_[month].atm where [n]=1,2...6
  for different latitude bands, [month]=january, april, july or october

interp_ig.f
  Fortran 77 program to interpolate original IG data (expanded from ig.tar) to
  a particular date and latitude, as an alternative to using fixed profiles for
  each season/latitude band.
  Required date and latitude can either be directly input via the terminal, or
  the name of a L1C file can be supplied in which case the program extracts the
  date/lat from that instead.
  Output is to a MORSE-compatible .atm file with name like
  IG_profiles_lat83N_0724.atm (83degN, 24 July).  
  Note that there is a PARAMETER CHARACTER*25 DIRIG which needs to be changed
  (and CHARACTER*25 changed accordingly) to point to the directory where the
  ig.tar file was expanded.
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