anchor.diff:  light2 = 100.0
   chroma1 = 40.0
   chroma2 = 40.0
  +chroma_exp = 1.0d0
   ncolors = 10
   convert1 = ''
   convert2 = ''
  
positive.code:     call lch2rgb(l,c,h,red,grn,blu)
      call checkrgb(red,grn,blu,clip)
      call rgb2lch(red,grn,blu,lcheck,ccheck,hcheck)
      ! Print nicely formatted RGB coordinates
      call formatrgb(red,grn,blu,rgbstring)
      if (gmtfile.eq.'none') then
          write(uout,'(A)') trim(rgbstring)
      else
  
negative.code: double precision :: hue(2)
  double precision :: lightness(2)
  double precision :: chroma(2)
  double precision :: chroma_exp
  character(len=16) :: color_path_type
  character(len=8) :: convert(2)
  double precision :: gmt_cpt_lims(2)
  character(len=8) :: output_mode
  
  integer :: verbose
  
  