lbl2xs
  computation of line-by-line molecular absorption cross sections

  usage:
  lbl2xs [options] line_parameter_file(s)

  -h            help
  -c  char      comment character(s) used in input,output file (default '#')
  -o  string    output file for saving of cross sections (if not given: write to StdOut)
                (in case of a list of input files / molecules, use a star as wildcard:
		 this will be replaced by the molecule name)

  -p  float(s)  pressure(s) (in mb,  default: p_ref of linefile, usually 1013.25mb=1atm)
  -T  float(s)  Temperature(s) (in K, default: T_ref of linefile, usually 296K)
 --pT file      with list of pressures in mb (first column) and temperatures in K (second column)
 --cpT 2ints    a pair of (non-negative) integers indicating the pressure and temperature columns in the pT file
                (default 0,1 for the very first and second column)

  -n  int       number of grids --- selects 'multigrid mode' for nGrids=2 or 3 (default) (nGrids=1 brute force)
  -g  int       gridRatio = ratio of coarse to fine grid spacing (only 2, 4, or 8, default 8)
  -W  float     transition from fine to coarse grid (in units of half widths, default 25.0)

  -a  float     air broadening half width, only used when not given in line list file
  -f  string    format for output file:  'a'='t'='xy' tabular ascii  OR  'h' hitran  OR  "."="p" pickled (default)
  -i  string    interpolation method   [default: '3' three-point Lagrange,  choices are one of "234lqcs"]
                (only required for multigrid approach or when cross sections for several p,T pairs are saved in xy format)
  -L  char      Lineshape: V(oigt), L(orentz), G(auss)     [default: Voigt]
  -s  float     sampling rate used for x-grid (default: 5.0 grid points per (mean) half width)
  -w  float     wing extension (cutoff wavenumber, default 10.0cm-1)
  -x  Interval  lower,upper wavenumbers (comma separated pair of floats [no blanks!],
                                        default set according to range of lines in datafile)

  If several line parameter files are given (usually for several molecules)
  AND if an output file (extension) has been specified (-o option)
  a cross section file will be generated for each line file:
  * if all line files have the same extension,
    the cross section files will have the old basename with the extension as specified by the -o option
  * otherwise the input file name will be augmented by the string specified as -o option

  For more information use
  lbl2xs --help

 End of lbl2xs help