/*
  cpt-city: pm/f-23-28-3 (cpt)

  Various gradients from Gnuplot: the original default pm3d
  colour gradient by Petr Mikulík from Masaryk University,
  nice rgb schemes listed in “help palette rgbformulae”
  and gradients from the pm3dcolors.dem demo script

  author: Petr Mikulik
  copyright: GPLv2
  year: 2006
  url: https://phillips.shef.ac.uk/pub/cpt-city/pm
*/
linear-gradient(
  0deg,
  rgb(  0, 128,   0)   0.000%,
  rgb(  0, 121,   4)   1.587%,
  rgb(  0, 115,   8)   3.175%,
  rgb(  0, 109,  12)   4.762%,
  rgb(  0, 103,  16)   6.349%,
  rgb(  0,  97,  20)   7.936%,
  rgb(  0,  91,  24)   9.524%,
  rgb(  0,  85,  28)  11.111%,
  rgb(  0,  79,  32)  12.698%,
  rgb(  0,  73,  36)  14.286%,
  rgb(  0,  67,  40)  15.873%,
  rgb(  0,  61,  45)  17.460%,
  rgb(  0,  55,  49)  19.048%,
  rgb(  0,  49,  53)  20.635%,
  rgb(  0,  43,  57)  22.222%,
  rgb(  0,  36,  61)  23.809%,
  rgb(  0,  30,  65)  25.397%,
  rgb(  0,  24,  69)  26.984%,
  rgb(  0,  18,  73)  28.571%,
  rgb(  0,  12,  77)  30.159%,
  rgb(  0,   6,  81)  31.746%,
  rgb(  0,   0,  85)  33.333%,
  rgb(  0,   6,  89)  34.921%,
  rgb(  0,  12,  93)  36.508%,
  rgb(  0,  18,  97)  38.095%,
  rgb(  0,  24, 101)  39.682%,
  rgb(  0,  30, 105)  41.270%,
  rgb(  0,  36, 109)  42.857%,
  rgb(  0,  42, 113)  44.444%,
  rgb(  0,  49, 117)  46.032%,
  rgb(  0,  55, 121)  47.619%,
  rgb(  0,  61, 125)  49.206%,
  rgb(  0,  67, 130)  50.794%,
  rgb(  0,  73, 134)  52.381%,
  rgb(  0,  79, 138)  53.968%,
  rgb(  0,  85, 142)  55.556%,
  rgb(  0,  91, 146)  57.143%,
  rgb(  0,  97, 150)  58.730%,
  rgb(  0, 103, 154)  60.318%,
  rgb(  0, 109, 158)  61.905%,
  rgb(  0, 115, 162)  63.492%,
  rgb(  0, 121, 166)  65.079%,
  rgb(  0, 127, 170)  66.667%,
  rgb( 12, 134, 174)  68.254%,
  rgb( 24, 140, 178)  69.841%,
  rgb( 36, 146, 182)  71.429%,
  rgb( 49, 152, 186)  73.016%,
  rgb( 61, 158, 190)  74.603%,
  rgb( 73, 164, 194)  76.191%,
  rgb( 85, 170, 198)  77.778%,
  rgb( 97, 176, 202)  79.365%,
  rgb(109, 182, 206)  80.952%,
  rgb(121, 188, 210)  82.540%,
  rgb(134, 194, 215)  84.127%,
  rgb(146, 200, 219)  85.714%,
  rgb(158, 206, 223)  87.302%,
  rgb(170, 212, 227)  88.889%,
  rgb(182, 219, 231)  90.476%,
  rgb(194, 225, 235)  92.064%,
  rgb(206, 231, 239)  93.651%,
  rgb(219, 237, 243)  95.238%,
  rgb(231, 243, 247)  96.825%,
  rgb(243, 249, 251)  98.413%,
  rgb(255, 255, 255) 100.000%
);