lbl2od
  computation of line-by-line optical depth due to molecular absorption

  usage:
  lbl2od  [options]  atm_file  line_parameter_file(s)

  -h               help
  -c     char      comment character(s) used in input,output file (default '#')
  -o     string    output file for saving of optical depth (if not given: write to StdOut)
                   (if the output file's extension ends with ".nc", ".ncdf" or ".netcdf",
                    a netcdf file is generated, otherwise the file is ascii tabular)

  -m     char      mode: 'c' ---> cumulative optical depth
                         'd' ---> difference (delta) optical depth (default)
                         'r' ---> reverse cumulative optical depth
	  	         't' ---> total optical depth

 --avg   int       running average:  return mean of some points
 --BoA   float     bottom-of-atmosphere altitude [km]  (compute opt.depth only for levels above) 
 --ToA   float     top-of-atmosphere altitude [km]     (compute opt.depth only for levels below) 
                   NOTE:  no interpolation, i.e. integration starts/stops at the next level above/below BoA/ToA
 --scale floats    multiply molecular concentrations with scaleFactors
                   (either a comma separated list of floats (no blanks) in the same order as for the line data files,
		    or just a single float to scale the profile of the molecule corresponding to the first lineFile.)
  -x     Interval  lower,upper wavenumbers (comma separated pair of floats [no blanks!],
                                            default set according to range of lines in datafiles)
 --cw              common wavenumbers only
                   (optical depth only calculated for spectral regions where ALL cross sections are nonzero)

 --nm              on output write optical depth versus wavelength [nm] (default: wavenumber 1/cm)
  -r               on output reverse layer optical depth order:  top <--> bottom of atmosphere
  -y               on output write only optical depth without x-values (wavenumbers etc)


  For more information use
  lbl2od --help