// cpt-city: jmn/jmn-d20 (cpt)
//
// A colourmap with monotonic luminance for simultaneous colour and
// grey-scale publications.
//
// J. McNames, "An effective color scale for simultaneous color and
// gray-scale publications," in IEEE Signal Processing Magazine,
// vol. 23, no. 1, pp. 82-96, Jan. 2006,
//
// author: James McNames
// copyright: Free to use
// year: 2009
// url: https://phillips.shef.ac.uk/pub/cpt-city/jmn
#declare jmn_d20 =
color_map {
  [0.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.05000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.05000 color rgbf <0.9569,0.8941,0.9843,0.0000>]
  [0.10000 color rgbf <0.9569,0.8941,0.9843,0.0000>]
  [0.10000 color rgbf <0.8784,0.8118,0.9882,0.0000>]
  [0.15000 color rgbf <0.8784,0.8118,0.9882,0.0000>]
  [0.15000 color rgbf <0.7686,0.7529,0.9961,0.0000>]
  [0.20000 color rgbf <0.7686,0.7529,0.9961,0.0000>]
  [0.20000 color rgbf <0.6353,0.7373,0.9882,0.0000>]
  [0.25000 color rgbf <0.6353,0.7373,0.9882,0.0000>]
  [0.25000 color rgbf <0.4980,0.7569,0.9490,0.0000>]
  [0.30000 color rgbf <0.4980,0.7569,0.9490,0.0000>]
  [0.30000 color rgbf <0.3686,0.8078,0.8667,0.0000>]
  [0.35000 color rgbf <0.3686,0.8078,0.8667,0.0000>]
  [0.35000 color rgbf <0.2706,0.8784,0.7373,0.0000>]
  [0.40000 color rgbf <0.2706,0.8784,0.7373,0.0000>]
  [0.40000 color rgbf <0.2196,0.9451,0.5647,0.0000>]
  [0.45000 color rgbf <0.2196,0.9451,0.5647,0.0000>]
  [0.45000 color rgbf <0.2314,0.9804,0.3608,0.0000>]
  [0.50000 color rgbf <0.2314,0.9804,0.3608,0.0000>]
  [0.50000 color rgbf <0.3098,0.9294,0.1765,0.0000>]
  [0.55000 color rgbf <0.3098,0.9294,0.1765,0.0000>]
  [0.55000 color rgbf <0.4078,0.7843,0.0627,0.0000>]
  [0.60000 color rgbf <0.4078,0.7843,0.0627,0.0000>]
  [0.60000 color rgbf <0.4745,0.6157,0.0078,0.0000>]
  [0.65000 color rgbf <0.4745,0.6157,0.0078,0.0000>]
  [0.65000 color rgbf <0.4980,0.4392,0.0000,0.0000>]
  [0.70000 color rgbf <0.4980,0.4392,0.0000,0.0000>]
  [0.70000 color rgbf <0.4784,0.2824,0.0235,0.0000>]
  [0.75000 color rgbf <0.4784,0.2824,0.0235,0.0000>]
  [0.75000 color rgbf <0.4118,0.1569,0.0588,0.0000>]
  [0.80000 color rgbf <0.4118,0.1569,0.0588,0.0000>]
  [0.80000 color rgbf <0.3137,0.0706,0.0863,0.0000>]
  [0.85000 color rgbf <0.3137,0.0706,0.0863,0.0000>]
  [0.85000 color rgbf <0.2000,0.0196,0.0902,0.0000>]
  [0.90000 color rgbf <0.2000,0.0196,0.0902,0.0000>]
  [0.90000 color rgbf <0.0902,0.0000,0.0588,0.0000>]
  [0.95000 color rgbf <0.0902,0.0000,0.0588,0.0000>]
  [0.95000 color rgbf <0.0000,0.0000,0.0000,0.0000>]
  [1.00000 color rgbf <0.0000,0.0000,0.0000,0.0000>]
}