'Main input data crt.dat: Data filenames for 3-D two-point ray tracing'

'model.dat'
'dcrt.dat'
'init.dat'
'code1.dat '
'len-rpa.dat'
'writ.dat'
'len-log.out'

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  Note: In most cases, it is convenient to locate data sets 'dcrt.dat',
      'init.dat' and 'code1.dat' within this data file, below the above
      strings with filenames.  Such an option is indicated by replacing
      the corresponding strings in the above data with blank strings.

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