// cpt-city: tl/gauss (ggr)
//
// Nonlinear greyscales
//
// author: Thomas Lotze
// copyright: Free to use
// year: 2004
// url: https://phillips.shef.ac.uk/pub/cpt-city/tl
#declare gauss =
color_map {
  [0.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.02657 color rgbf <1.0000,1.0000,1.0000,0.0020>]
  [0.03761 color rgbf <1.0000,1.0000,1.0000,0.0039>]
  [0.03761 color rgbf <1.0000,1.0000,1.0000,0.0078>]
  [0.04611 color rgbf <1.0000,1.0000,1.0000,0.0098>]
  [0.05329 color rgbf <1.0000,1.0000,1.0000,0.0118>]
  [0.05329 color rgbf <1.0000,1.0000,1.0000,0.0157>]
  [0.05964 color rgbf <1.0000,1.0000,1.0000,0.0176>]
  [0.06540 color rgbf <1.0000,1.0000,1.0000,0.0196>]
  [0.06540 color rgbf <1.0000,1.0000,1.0000,0.0235>]
  [0.07071 color rgbf <1.0000,1.0000,1.0000,0.0255>]
  [0.07567 color rgbf <1.0000,1.0000,1.0000,0.0275>]
  [0.07567 color rgbf <1.0000,1.0000,1.0000,0.0314>]
  [0.08034 color rgbf <1.0000,1.0000,1.0000,0.0333>]
  [0.08477 color rgbf <1.0000,1.0000,1.0000,0.0353>]
  [0.08477 color rgbf <1.0000,1.0000,1.0000,0.0392>]
  [0.08900 color rgbf <1.0000,1.0000,1.0000,0.0412>]
  [0.09305 color rgbf <1.0000,1.0000,1.0000,0.0431>]
  [0.09305 color rgbf <1.0000,1.0000,1.0000,0.0471>]
  [0.09695 color rgbf <1.0000,1.0000,1.0000,0.0490>]
  [0.10071 color rgbf <1.0000,1.0000,1.0000,0.0510>]
  [0.10071 color rgbf <1.0000,1.0000,1.0000,0.0549>]
  [0.10435 color rgbf <1.0000,1.0000,1.0000,0.0569>]
  [0.10788 color rgbf <1.0000,1.0000,1.0000,0.0588>]
  [0.10788 color rgbf <1.0000,1.0000,1.0000,0.0627>]
  [0.11132 color rgbf <1.0000,1.0000,1.0000,0.0647>]
  [0.11466 color rgbf <1.0000,1.0000,1.0000,0.0667>]
  [0.11466 color rgbf <1.0000,1.0000,1.0000,0.0706>]
  [0.11793 color rgbf <1.0000,1.0000,1.0000,0.0725>]
  [0.12112 color rgbf <1.0000,1.0000,1.0000,0.0745>]
  [0.12112 color rgbf <1.0000,1.0000,1.0000,0.0784>]
  [0.12424 color rgbf <1.0000,1.0000,1.0000,0.0804>]
  [0.12730 color rgbf <1.0000,1.0000,1.0000,0.0824>]
  [0.12730 color rgbf <1.0000,1.0000,1.0000,0.0863>]
  [0.13029 color rgbf <1.0000,1.0000,1.0000,0.0882>]
  [0.13324 color rgbf <1.0000,1.0000,1.0000,0.0902>]
  [0.13324 color rgbf <1.0000,1.0000,1.0000,0.0941>]
  [0.13613 color rgbf <1.0000,1.0000,1.0000,0.0961>]
  [0.13897 color rgbf <1.0000,1.0000,1.0000,0.0980>]
  [0.13897 color rgbf <1.0000,1.0000,1.0000,0.1020>]
  [0.14177 color rgbf <1.0000,1.0000,1.0000,0.1039>]
  [0.14453 color rgbf <1.0000,1.0000,1.0000,0.1059>]
  [0.14453 color rgbf <1.0000,1.0000,1.0000,0.1098>]
  [0.14725 color rgbf <1.0000,1.0000,1.0000,0.1118>]
  [0.14993 color rgbf <1.0000,1.0000,1.0000,0.1137>]
  [0.14993 color rgbf <1.0000,1.0000,1.0000,0.1176>]
  [0.15257 color rgbf <1.0000,1.0000,1.0000,0.1196>]
  [0.15518 color rgbf <1.0000,1.0000,1.0000,0.1216>]
  [0.15518 color rgbf <1.0000,1.0000,1.0000,0.1255>]
  [0.15776 color rgbf <1.0000,1.0000,1.0000,0.1275>]
  [0.16031 color rgbf <1.0000,1.0000,1.0000,0.1294>]
  [0.16031 color rgbf <1.0000,1.0000,1.0000,0.1333>]
  [0.16283 color rgbf <1.0000,1.0000,1.0000,0.1353>]
  [0.16532 color rgbf <1.0000,1.0000,1.0000,0.1373>]
  [0.16532 color rgbf <1.0000,1.0000,1.0000,0.1412>]
  [0.16778 color rgbf <1.0000,1.0000,1.0000,0.1431>]
  [0.17023 color rgbf <1.0000,1.0000,1.0000,0.1451>]
  [0.17023 color rgbf <1.0000,1.0000,1.0000,0.1490>]
  [0.17264 color rgbf <1.0000,1.0000,1.0000,0.1510>]
  [0.17504 color rgbf <1.0000,1.0000,1.0000,0.1529>]
  [0.17504 color rgbf <1.0000,1.0000,1.0000,0.1569>]
  [0.17741 color rgbf <1.0000,1.0000,1.0000,0.1588>]
  [0.17977 color rgbf <1.0000,1.0000,1.0000,0.1608>]
  [0.17977 color rgbf <1.0000,1.0000,1.0000,0.1647>]
  [0.18210 color rgbf <1.0000,1.0000,1.0000,0.1667>]
  [0.18442 color rgbf <1.0000,1.0000,1.0000,0.1686>]
  [0.18442 color rgbf <1.0000,1.0000,1.0000,0.1725>]
  [0.18672 color rgbf <1.0000,1.0000,1.0000,0.1745>]
  [0.18900 color rgbf <1.0000,1.0000,1.0000,0.1765>]
  [0.18900 color rgbf <1.0000,1.0000,1.0000,0.1804>]
  [0.19126 color rgbf <1.0000,1.0000,1.0000,0.1824>]
  [0.19351 color rgbf <1.0000,1.0000,1.0000,0.1843>]
  [0.19351 color rgbf <1.0000,1.0000,1.0000,0.1882>]
  [0.19574 color rgbf <1.0000,1.0000,1.0000,0.1902>]
  [0.19796 color rgbf <1.0000,1.0000,1.0000,0.1922>]
  [0.19796 color rgbf <1.0000,1.0000,1.0000,0.1961>]
  [0.20016 color rgbf <1.0000,1.0000,1.0000,0.1980>]
  [0.20235 color rgbf <1.0000,1.0000,1.0000,0.2000>]
  [0.20235 color rgbf <1.0000,1.0000,1.0000,0.2039>]
  [0.20453 color rgbf <1.0000,1.0000,1.0000,0.2059>]
  [0.20670 color rgbf <1.0000,1.0000,1.0000,0.2078>]
  [0.20670 color rgbf <1.0000,1.0000,1.0000,0.2118>]
  [0.20885 color rgbf <1.0000,1.0000,1.0000,0.2137>]
  [0.21099 color rgbf <1.0000,1.0000,1.0000,0.2157>]
  [0.21099 color rgbf <1.0000,1.0000,1.0000,0.2196>]
  [0.21312 color rgbf <1.0000,1.0000,1.0000,0.2216>]
  [0.21524 color rgbf <1.0000,1.0000,1.0000,0.2235>]
  [0.21524 color rgbf <1.0000,1.0000,1.0000,0.2275>]
  [0.21736 color rgbf <1.0000,1.0000,1.0000,0.2294>]
  [0.21946 color rgbf <1.0000,1.0000,1.0000,0.2314>]
  [0.21946 color rgbf <1.0000,1.0000,1.0000,0.2353>]
  [0.22155 color rgbf <1.0000,1.0000,1.0000,0.2373>]
  [0.22363 color rgbf <1.0000,1.0000,1.0000,0.2392>]
  [0.22363 color rgbf <1.0000,1.0000,1.0000,0.2431>]
  [0.22570 color rgbf <1.0000,1.0000,1.0000,0.2451>]
  [0.22777 color rgbf <1.0000,1.0000,1.0000,0.2471>]
  [0.22777 color rgbf <1.0000,1.0000,1.0000,0.2510>]
  [0.22983 color rgbf <1.0000,1.0000,1.0000,0.2529>]
  [0.23188 color rgbf <1.0000,1.0000,1.0000,0.2549>]
  [0.23188 color rgbf <1.0000,1.0000,1.0000,0.2588>]
  [0.23392 color rgbf <1.0000,1.0000,1.0000,0.2608>]
  [0.23596 color rgbf <1.0000,1.0000,1.0000,0.2627>]
  [0.23596 color rgbf <1.0000,1.0000,1.0000,0.2667>]
  [0.23799 color rgbf <1.0000,1.0000,1.0000,0.2686>]
  [0.24001 color rgbf <1.0000,1.0000,1.0000,0.2706>]
  [0.24001 color rgbf <1.0000,1.0000,1.0000,0.2745>]
  [0.24203 color rgbf <1.0000,1.0000,1.0000,0.2765>]
  [0.24404 color rgbf <1.0000,1.0000,1.0000,0.2784>]
  [0.24404 color rgbf <1.0000,1.0000,1.0000,0.2824>]
  [0.24604 color rgbf <1.0000,1.0000,1.0000,0.2843>]
  [0.24804 color rgbf <1.0000,1.0000,1.0000,0.2863>]
  [0.24804 color rgbf <1.0000,1.0000,1.0000,0.2902>]
  [0.25004 color rgbf <1.0000,1.0000,1.0000,0.2922>]
  [0.25203 color rgbf <1.0000,1.0000,1.0000,0.2941>]
  [0.25203 color rgbf <1.0000,1.0000,1.0000,0.2980>]
  [0.25401 color rgbf <1.0000,1.0000,1.0000,0.3000>]
  [0.25599 color rgbf <1.0000,1.0000,1.0000,0.3020>]
  [0.25599 color rgbf <1.0000,1.0000,1.0000,0.3059>]
  [0.25797 color rgbf <1.0000,1.0000,1.0000,0.3078>]
  [0.25994 color rgbf <1.0000,1.0000,1.0000,0.3098>]
  [0.25994 color rgbf <1.0000,1.0000,1.0000,0.3137>]
  [0.26191 color rgbf <1.0000,1.0000,1.0000,0.3157>]
  [0.26388 color rgbf <1.0000,1.0000,1.0000,0.3176>]
  [0.26388 color rgbf <1.0000,1.0000,1.0000,0.3216>]
  [0.26584 color rgbf <1.0000,1.0000,1.0000,0.3235>]
  [0.26780 color rgbf <1.0000,1.0000,1.0000,0.3255>]
  [0.26780 color rgbf <1.0000,1.0000,1.0000,0.3294>]
  [0.26976 color rgbf <1.0000,1.0000,1.0000,0.3314>]
  [0.27171 color rgbf <1.0000,1.0000,1.0000,0.3333>]
  [0.27171 color rgbf <1.0000,1.0000,1.0000,0.3373>]
  [0.27366 color rgbf <1.0000,1.0000,1.0000,0.3392>]
  [0.27561 color rgbf <1.0000,1.0000,1.0000,0.3412>]
  [0.27561 color rgbf <1.0000,1.0000,1.0000,0.3451>]
  [0.27755 color rgbf <1.0000,1.0000,1.0000,0.3471>]
  [0.27950 color rgbf <1.0000,1.0000,1.0000,0.3490>]
  [0.27950 color rgbf <1.0000,1.0000,1.0000,0.3529>]
  [0.28144 color rgbf <1.0000,1.0000,1.0000,0.3549>]
  [0.28338 color rgbf <1.0000,1.0000,1.0000,0.3569>]
  [0.28338 color rgbf <1.0000,1.0000,1.0000,0.3608>]
  [0.28532 color rgbf <1.0000,1.0000,1.0000,0.3627>]
  [0.28726 color rgbf <1.0000,1.0000,1.0000,0.3647>]
  [0.28726 color rgbf <1.0000,1.0000,1.0000,0.3686>]
  [0.28920 color rgbf <1.0000,1.0000,1.0000,0.3706>]
  [0.29113 color rgbf <1.0000,1.0000,1.0000,0.3725>]
  [0.29113 color rgbf <1.0000,1.0000,1.0000,0.3765>]
  [0.29307 color rgbf <1.0000,1.0000,1.0000,0.3784>]
  [0.29500 color rgbf <1.0000,1.0000,1.0000,0.3804>]
  [0.29500 color rgbf <1.0000,1.0000,1.0000,0.3843>]
  [0.29694 color rgbf <1.0000,1.0000,1.0000,0.3863>]
  [0.29887 color rgbf <1.0000,1.0000,1.0000,0.3882>]
  [0.29887 color rgbf <1.0000,1.0000,1.0000,0.3922>]
  [0.30081 color rgbf <1.0000,1.0000,1.0000,0.3941>]
  [0.30274 color rgbf <1.0000,1.0000,1.0000,0.3961>]
  [0.30274 color rgbf <1.0000,1.0000,1.0000,0.4000>]
  [0.30467 color rgbf <1.0000,1.0000,1.0000,0.4020>]
  [0.30661 color rgbf <1.0000,1.0000,1.0000,0.4039>]
  [0.30661 color rgbf <1.0000,1.0000,1.0000,0.4078>]
  [0.30854 color rgbf <1.0000,1.0000,1.0000,0.4098>]
  [0.31048 color rgbf <1.0000,1.0000,1.0000,0.4118>]
  [0.31048 color rgbf <1.0000,1.0000,1.0000,0.4157>]
  [0.31242 color rgbf <1.0000,1.0000,1.0000,0.4176>]
  [0.31435 color rgbf <1.0000,1.0000,1.0000,0.4196>]
  [0.31435 color rgbf <1.0000,1.0000,1.0000,0.4235>]
  [0.31629 color rgbf <1.0000,1.0000,1.0000,0.4255>]
  [0.31823 color rgbf <1.0000,1.0000,1.0000,0.4275>]
  [0.31823 color rgbf <1.0000,1.0000,1.0000,0.4314>]
  [0.32017 color rgbf <1.0000,1.0000,1.0000,0.4333>]
  [0.32212 color rgbf <1.0000,1.0000,1.0000,0.4353>]
  [0.32212 color rgbf <1.0000,1.0000,1.0000,0.4392>]
  [0.32406 color rgbf <1.0000,1.0000,1.0000,0.4412>]
  [0.32601 color rgbf <1.0000,1.0000,1.0000,0.4431>]
  [0.32601 color rgbf <1.0000,1.0000,1.0000,0.4471>]
  [0.32796 color rgbf <1.0000,1.0000,1.0000,0.4490>]
  [0.32991 color rgbf <1.0000,1.0000,1.0000,0.4510>]
  [0.32991 color rgbf <1.0000,1.0000,1.0000,0.4549>]
  [0.33186 color rgbf <1.0000,1.0000,1.0000,0.4569>]
  [0.33382 color rgbf <1.0000,1.0000,1.0000,0.4588>]
  [0.33382 color rgbf <1.0000,1.0000,1.0000,0.4627>]
  [0.33578 color rgbf <1.0000,1.0000,1.0000,0.4647>]
  [0.33774 color rgbf <1.0000,1.0000,1.0000,0.4667>]
  [0.33774 color rgbf <1.0000,1.0000,1.0000,0.4706>]
  [0.33970 color rgbf <1.0000,1.0000,1.0000,0.4725>]
  [0.34167 color rgbf <1.0000,1.0000,1.0000,0.4745>]
  [0.34167 color rgbf <1.0000,1.0000,1.0000,0.4784>]
  [0.34364 color rgbf <1.0000,1.0000,1.0000,0.4804>]
  [0.34562 color rgbf <1.0000,1.0000,1.0000,0.4824>]
  [0.34562 color rgbf <1.0000,1.0000,1.0000,0.4863>]
  [0.34760 color rgbf <1.0000,1.0000,1.0000,0.4882>]
  [0.34958 color rgbf <1.0000,1.0000,1.0000,0.4902>]
  [0.34958 color rgbf <1.0000,1.0000,1.0000,0.4941>]
  [0.35156 color rgbf <1.0000,1.0000,1.0000,0.4961>]
  [0.35355 color rgbf <1.0000,1.0000,1.0000,0.4980>]
  [0.35355 color rgbf <1.0000,1.0000,1.0000,0.5020>]
  [0.35555 color rgbf <1.0000,1.0000,1.0000,0.5039>]
  [0.35755 color rgbf <1.0000,1.0000,1.0000,0.5059>]
  [0.35755 color rgbf <1.0000,1.0000,1.0000,0.5098>]
  [0.35955 color rgbf <1.0000,1.0000,1.0000,0.5118>]
  [0.36156 color rgbf <1.0000,1.0000,1.0000,0.5137>]
  [0.36156 color rgbf <1.0000,1.0000,1.0000,0.5176>]
  [0.36357 color rgbf <1.0000,1.0000,1.0000,0.5196>]
  [0.36559 color rgbf <1.0000,1.0000,1.0000,0.5216>]
  [0.36559 color rgbf <1.0000,1.0000,1.0000,0.5255>]
  [0.36762 color rgbf <1.0000,1.0000,1.0000,0.5275>]
  [0.36965 color rgbf <1.0000,1.0000,1.0000,0.5294>]
  [0.36965 color rgbf <1.0000,1.0000,1.0000,0.5333>]
  [0.37168 color rgbf <1.0000,1.0000,1.0000,0.5353>]
  [0.37372 color rgbf <1.0000,1.0000,1.0000,0.5373>]
  [0.37372 color rgbf <1.0000,1.0000,1.0000,0.5412>]
  [0.37577 color rgbf <1.0000,1.0000,1.0000,0.5431>]
  [0.37783 color rgbf <1.0000,1.0000,1.0000,0.5451>]
  [0.37783 color rgbf <1.0000,1.0000,1.0000,0.5490>]
  [0.37989 color rgbf <1.0000,1.0000,1.0000,0.5510>]
  [0.38195 color rgbf <1.0000,1.0000,1.0000,0.5529>]
  [0.38195 color rgbf <1.0000,1.0000,1.0000,0.5569>]
  [0.38403 color rgbf <1.0000,1.0000,1.0000,0.5588>]
  [0.38611 color rgbf <1.0000,1.0000,1.0000,0.5608>]
  [0.38611 color rgbf <1.0000,1.0000,1.0000,0.5647>]
  [0.38820 color rgbf <1.0000,1.0000,1.0000,0.5667>]
  [0.39030 color rgbf <1.0000,1.0000,1.0000,0.5686>]
  [0.39030 color rgbf <1.0000,1.0000,1.0000,0.5725>]
  [0.39240 color rgbf <1.0000,1.0000,1.0000,0.5745>]
  [0.39451 color rgbf <1.0000,1.0000,1.0000,0.5765>]
  [0.39451 color rgbf <1.0000,1.0000,1.0000,0.5804>]
  [0.39663 color rgbf <1.0000,1.0000,1.0000,0.5824>]
  [0.39876 color rgbf <1.0000,1.0000,1.0000,0.5843>]
  [0.39876 color rgbf <1.0000,1.0000,1.0000,0.5882>]
  [0.40090 color rgbf <1.0000,1.0000,1.0000,0.5902>]
  [0.40304 color rgbf <1.0000,1.0000,1.0000,0.5922>]
  [0.40304 color rgbf <1.0000,1.0000,1.0000,0.5961>]
  [0.40520 color rgbf <1.0000,1.0000,1.0000,0.5980>]
  [0.40737 color rgbf <1.0000,1.0000,1.0000,0.6000>]
  [0.40737 color rgbf <1.0000,1.0000,1.0000,0.6039>]
  [0.40954 color rgbf <1.0000,1.0000,1.0000,0.6059>]
  [0.41173 color rgbf <1.0000,1.0000,1.0000,0.6078>]
  [0.41173 color rgbf <1.0000,1.0000,1.0000,0.6118>]
  [0.41392 color rgbf <1.0000,1.0000,1.0000,0.6137>]
  [0.41613 color rgbf <1.0000,1.0000,1.0000,0.6157>]
  [0.41613 color rgbf <1.0000,1.0000,1.0000,0.6196>]
  [0.41834 color rgbf <1.0000,1.0000,1.0000,0.6216>]
  [0.42057 color rgbf <1.0000,1.0000,1.0000,0.6235>]
  [0.42057 color rgbf <1.0000,1.0000,1.0000,0.6275>]
  [0.42281 color rgbf <1.0000,1.0000,1.0000,0.6294>]
  [0.42506 color rgbf <1.0000,1.0000,1.0000,0.6314>]
  [0.42506 color rgbf <1.0000,1.0000,1.0000,0.6353>]
  [0.42732 color rgbf <1.0000,1.0000,1.0000,0.6373>]
  [0.42960 color rgbf <1.0000,1.0000,1.0000,0.6392>]
  [0.42960 color rgbf <1.0000,1.0000,1.0000,0.6431>]
  [0.43189 color rgbf <1.0000,1.0000,1.0000,0.6451>]
  [0.43419 color rgbf <1.0000,1.0000,1.0000,0.6471>]
  [0.43419 color rgbf <1.0000,1.0000,1.0000,0.6510>]
  [0.43650 color rgbf <1.0000,1.0000,1.0000,0.6529>]
  [0.43883 color rgbf <1.0000,1.0000,1.0000,0.6549>]
  [0.43883 color rgbf <1.0000,1.0000,1.0000,0.6588>]
  [0.44117 color rgbf <1.0000,1.0000,1.0000,0.6608>]
  [0.44353 color rgbf <1.0000,1.0000,1.0000,0.6627>]
  [0.44353 color rgbf <1.0000,1.0000,1.0000,0.6667>]
  [0.44590 color rgbf <1.0000,1.0000,1.0000,0.6686>]
  [0.44829 color rgbf <1.0000,1.0000,1.0000,0.6706>]
  [0.44829 color rgbf <1.0000,1.0000,1.0000,0.6745>]
  [0.45069 color rgbf <1.0000,1.0000,1.0000,0.6765>]
  [0.45311 color rgbf <1.0000,1.0000,1.0000,0.6784>]
  [0.45311 color rgbf <1.0000,1.0000,1.0000,0.6824>]
  [0.45554 color rgbf <1.0000,1.0000,1.0000,0.6843>]
  [0.45800 color rgbf <1.0000,1.0000,1.0000,0.6863>]
  [0.45800 color rgbf <1.0000,1.0000,1.0000,0.6902>]
  [0.46046 color rgbf <1.0000,1.0000,1.0000,0.6922>]
  [0.46295 color rgbf <1.0000,1.0000,1.0000,0.6941>]
  [0.46295 color rgbf <1.0000,1.0000,1.0000,0.6980>]
  [0.46546 color rgbf <1.0000,1.0000,1.0000,0.7000>]
  [0.46798 color rgbf <1.0000,1.0000,1.0000,0.7020>]
  [0.46798 color rgbf <1.0000,1.0000,1.0000,0.7059>]
  [0.47053 color rgbf <1.0000,1.0000,1.0000,0.7078>]
  [0.47309 color rgbf <1.0000,1.0000,1.0000,0.7098>]
  [0.47309 color rgbf <1.0000,1.0000,1.0000,0.7137>]
  [0.47568 color rgbf <1.0000,1.0000,1.0000,0.7157>]
  [0.47829 color rgbf <1.0000,1.0000,1.0000,0.7176>]
  [0.47829 color rgbf <1.0000,1.0000,1.0000,0.7216>]
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