/*
  cpt-city: jmn/jmn-c32 (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
*/
linear-gradient(
  0deg,
  rgb(255, 255, 255)   0.000%,
  rgb(249, 238, 252)   3.226%,
  rgb(240, 223, 251)   6.452%,
  rgb(228, 210, 252)   9.677%,
  rgb(212, 199, 253)  12.903%,
  rgb(194, 192, 254)  16.129%,
  rgb(174, 188, 254)  19.355%,
  rgb(152, 188, 250)  22.581%,
  rgb(130, 192, 244)  25.806%,
  rgb(109, 199, 233)  29.032%,
  rgb( 91, 208, 218)  32.258%,
  rgb( 75, 219, 198)  35.484%,
  rgb( 63, 230, 174)  38.710%,
  rgb( 57, 240, 146)  41.935%,
  rgb( 56, 248, 115)  45.161%,
  rgb( 61, 250,  82)  48.387%,
  rgb( 74, 242,  53)  51.613%,
  rgb( 90, 223,  31)  54.839%,
  rgb(105, 199,  16)  58.065%,
  rgb(116, 173,   6)  61.290%,
  rgb(124, 145,   1)  64.516%,
  rgb(127, 118,   0)  67.742%,
  rgb(126,  92,   2)  70.968%,
  rgb(120,  69,   7)  74.194%,
  rgb(111,  48,  12)  77.419%,
  rgb( 97,  32,  17)  80.645%,
  rgb( 82,  19,  21)  83.871%,
  rgb( 64,  10,  23)  87.097%,
  rgb( 46,   4,  22)  90.323%,
  rgb( 29,   1,  18)  93.548%,
  rgb( 13,   0,  10)  96.774%,
  rgb(  0,   0,   0) 100.000%
);