// cpt-city: fme/feet/natural (cpt)
//
// Gradients taken from the source-code of drawmap, a cartographic
// package by Fred M. Erickson
//
// author: Fred M. Erickson
// copyright: GPLv2
// year: 2005
// url: https://phillips.shef.ac.uk/pub/cpt-city/fme/feet
#declare natural =
color_map {
  [0.00000 color rgbf <0.7451,1.0000,0.6863,0.0000>]
  [0.03333 color rgbf <0.7647,0.9294,0.6471,0.0000>]
  [0.06667 color rgbf <0.7843,0.8235,0.6118,0.0000>]
  [0.10000 color rgbf <0.8039,0.7608,0.5765,0.0000>]
  [0.13333 color rgbf <0.8235,0.6980,0.5412,0.0000>]
  [0.16667 color rgbf <0.8431,0.6353,0.5059,0.0000>]
  [0.20000 color rgbf <0.8627,0.5686,0.4706,0.0000>]
  [0.23333 color rgbf <0.8118,0.5882,0.5294,0.0000>]
  [0.26667 color rgbf <0.7569,0.6078,0.5882,0.0000>]
  [0.30000 color rgbf <0.7020,0.6275,0.6471,0.0000>]
  [0.33333 color rgbf <0.6471,0.6471,0.7059,0.0000>]
  [0.36667 color rgbf <0.8235,0.8235,1.0000,0.0000>]
  [0.40000 color rgbf <0.9098,0.9098,1.0000,0.0000>]
  [1.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
}