// cpt-city: jjg/polarity/PRGn (cpt)
//
// Diverging gradients which are continuous except at
// the centre-point, for emphasis of the sign of the data.
// Here the colour-stops are taken from the diverging
// schemes by Cynthia Brewer.
//
// author: J.J. Green
// copyright: Apache-like
// year: 2004
// url: https://phillips.shef.ac.uk/pub/cpt-city/jjg/polarity
#declare PRGn =
color_map {
  [0.00000 color rgbf <0.2510,0.0000,0.2941,0.0000>]
  [0.12500 color rgbf <0.4627,0.1647,0.5137,0.0000>]
  [0.25000 color rgbf <0.6000,0.4392,0.6706,0.0000>]
  [0.37500 color rgbf <0.7608,0.6471,0.8118,0.0000>]
  [0.50000 color rgbf <0.9059,0.8314,0.9098,0.0000>]
  [0.50000 color rgbf <0.8510,0.9412,0.8275,0.0000>]
  [0.62500 color rgbf <0.6510,0.8588,0.6275,0.0000>]
  [0.75000 color rgbf <0.3529,0.6824,0.3804,0.0000>]
  [0.87500 color rgbf <0.1059,0.4706,0.2157,0.0000>]
  [1.00000 color rgbf <0.0000,0.2667,0.1059,0.0000>]
}