// cpt-city: pm/pm3d21 (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
#declare pm3d21 =
color_map {
  [0.00000 color rgbf <0.0000,0.0000,0.0000,0.0000>]
  [0.25000 color rgbf <1.0000,0.0000,0.2510,0.0000>]
  [0.25000 color rgbf <0.0000,0.5020,0.2510,0.0000>]
  [0.50000 color rgbf <0.0000,0.5020,0.5020,0.0000>]
  [0.50000 color rgbf <0.0000,0.0000,0.5020,0.0000>]
  [1.00000 color rgbf <0.0000,0.0000,1.0000,0.0000>]
}