od2ri
  (absorption) optical depth to radiation intensity --- Schwarzschild solver

  usage:
  od2ri   [options]  opticalDepthFile

  -h              help
  -c    char      comment character(s) used in input,output file (default '#')
  -o    string    output file for saving of radiances (if not given: write to StdOut)

 --BoA  float     bottom-of-atmosphere altitude [km]  (read opt.depth only for levels above)
 --ToA  float     top-of-atmosphere altitude [km]     (read opt.depth only for levels below)
                  NOTE:  no interpolation, i.e. integration starts/stops at the next level above/below BoA/ToA
  -C              flag indicating that input optical depth is cumulative (default: difference/delta od)
  -q   char       quadrature method:  default 'T'=trapez=linear in tau, 'E'=exponential in tau
  -T   float      surface temperature [K]  (default 0)
  -v              flag: verbose
  -x   Interval   lower,upper wavenumbers (comma separated pair of floats [no blanks!],
                                           default set according to range of optical depth in datafiles)
  -z   float      zenith angle (uplooking: 0dg, downlooking 180dg)
                  NOTE:  a horizontal view, i.e. angle=90dg, is not implemented!!!


  WARNING:
  od2ri  does not know the type of optical depth (delta or accumulated ...) given in the input file!
         ===> use the -C flag if you have accumulated optical depth

 End of od2ri help