// cpt-city: tl/exponential (ggr)
//
// Nonlinear greyscales
//
// author: Thomas Lotze
// copyright: Free to use
// year: 2004
// url: https://phillips.shef.ac.uk/pub/cpt-city/tl
#declare exponential =
color_map {
  [0.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.00071 color rgbf <1.0000,1.0000,1.0000,0.0020>]
  [0.00141 color rgbf <1.0000,1.0000,1.0000,0.0039>]
  [0.00141 color rgbf <1.0000,1.0000,1.0000,0.0078>]
  [0.00213 color rgbf <1.0000,1.0000,1.0000,0.0098>]
  [0.00284 color rgbf <1.0000,1.0000,1.0000,0.0118>]
  [0.00284 color rgbf <1.0000,1.0000,1.0000,0.0157>]
  [0.00356 color rgbf <1.0000,1.0000,1.0000,0.0176>]
  [0.00428 color rgbf <1.0000,1.0000,1.0000,0.0196>]
  [0.00428 color rgbf <1.0000,1.0000,1.0000,0.0235>]
  [0.00500 color rgbf <1.0000,1.0000,1.0000,0.0255>]
  [0.00573 color rgbf <1.0000,1.0000,1.0000,0.0275>]
  [0.00573 color rgbf <1.0000,1.0000,1.0000,0.0314>]
  [0.00645 color rgbf <1.0000,1.0000,1.0000,0.0333>]
  [0.00719 color rgbf <1.0000,1.0000,1.0000,0.0353>]
  [0.00719 color rgbf <1.0000,1.0000,1.0000,0.0392>]
  [0.00792 color rgbf <1.0000,1.0000,1.0000,0.0412>]
  [0.00866 color rgbf <1.0000,1.0000,1.0000,0.0431>]
  [0.00866 color rgbf <1.0000,1.0000,1.0000,0.0471>]
  [0.00940 color rgbf <1.0000,1.0000,1.0000,0.0490>]
  [0.01014 color rgbf <1.0000,1.0000,1.0000,0.0510>]
  [0.01014 color rgbf <1.0000,1.0000,1.0000,0.0549>]
  [0.01089 color rgbf <1.0000,1.0000,1.0000,0.0569>]
  [0.01164 color rgbf <1.0000,1.0000,1.0000,0.0588>]
  [0.01164 color rgbf <1.0000,1.0000,1.0000,0.0627>]
  [0.01239 color rgbf <1.0000,1.0000,1.0000,0.0647>]
  [0.01315 color rgbf <1.0000,1.0000,1.0000,0.0667>]
  [0.01315 color rgbf <1.0000,1.0000,1.0000,0.0706>]
  [0.01391 color rgbf <1.0000,1.0000,1.0000,0.0725>]
  [0.01467 color rgbf <1.0000,1.0000,1.0000,0.0745>]
  [0.01467 color rgbf <1.0000,1.0000,1.0000,0.0784>]
  [0.01544 color rgbf <1.0000,1.0000,1.0000,0.0804>]
  [0.01620 color rgbf <1.0000,1.0000,1.0000,0.0824>]
  [0.01620 color rgbf <1.0000,1.0000,1.0000,0.0863>]
  [0.01698 color rgbf <1.0000,1.0000,1.0000,0.0882>]
  [0.01775 color rgbf <1.0000,1.0000,1.0000,0.0902>]
  [0.01775 color rgbf <1.0000,1.0000,1.0000,0.0941>]
  [0.01853 color rgbf <1.0000,1.0000,1.0000,0.0961>]
  [0.01931 color rgbf <1.0000,1.0000,1.0000,0.0980>]
  [0.01931 color rgbf <1.0000,1.0000,1.0000,0.1020>]
  [0.02010 color rgbf <1.0000,1.0000,1.0000,0.1039>]
  [0.02089 color rgbf <1.0000,1.0000,1.0000,0.1059>]
  [0.02089 color rgbf <1.0000,1.0000,1.0000,0.1098>]
  [0.02168 color rgbf <1.0000,1.0000,1.0000,0.1118>]
  [0.02248 color rgbf <1.0000,1.0000,1.0000,0.1137>]
  [0.02248 color rgbf <1.0000,1.0000,1.0000,0.1176>]
  [0.02328 color rgbf <1.0000,1.0000,1.0000,0.1196>]
  [0.02408 color rgbf <1.0000,1.0000,1.0000,0.1216>]
  [0.02408 color rgbf <1.0000,1.0000,1.0000,0.1255>]
  [0.02489 color rgbf <1.0000,1.0000,1.0000,0.1275>]
  [0.02570 color rgbf <1.0000,1.0000,1.0000,0.1294>]
  [0.02570 color rgbf <1.0000,1.0000,1.0000,0.1333>]
  [0.02651 color rgbf <1.0000,1.0000,1.0000,0.1353>]
  [0.02733 color rgbf <1.0000,1.0000,1.0000,0.1373>]
  [0.02733 color rgbf <1.0000,1.0000,1.0000,0.1412>]
  [0.02815 color rgbf <1.0000,1.0000,1.0000,0.1431>]
  [0.02898 color rgbf <1.0000,1.0000,1.0000,0.1451>]
  [0.02898 color rgbf <1.0000,1.0000,1.0000,0.1490>]
  [0.02981 color rgbf <1.0000,1.0000,1.0000,0.1510>]
  [0.03064 color rgbf <1.0000,1.0000,1.0000,0.1529>]
  [0.03064 color rgbf <1.0000,1.0000,1.0000,0.1569>]
  [0.03148 color rgbf <1.0000,1.0000,1.0000,0.1588>]
  [0.03232 color rgbf <1.0000,1.0000,1.0000,0.1608>]
  [0.03232 color rgbf <1.0000,1.0000,1.0000,0.1647>]
  [0.03316 color rgbf <1.0000,1.0000,1.0000,0.1667>]
  [0.03401 color rgbf <1.0000,1.0000,1.0000,0.1686>]
  [0.03401 color rgbf <1.0000,1.0000,1.0000,0.1725>]
  [0.03486 color rgbf <1.0000,1.0000,1.0000,0.1745>]
  [0.03572 color rgbf <1.0000,1.0000,1.0000,0.1765>]
  [0.03572 color rgbf <1.0000,1.0000,1.0000,0.1804>]
  [0.03658 color rgbf <1.0000,1.0000,1.0000,0.1824>]
  [0.03744 color rgbf <1.0000,1.0000,1.0000,0.1843>]
  [0.03744 color rgbf <1.0000,1.0000,1.0000,0.1882>]
  [0.03831 color rgbf <1.0000,1.0000,1.0000,0.1902>]
  [0.03919 color rgbf <1.0000,1.0000,1.0000,0.1922>]
  [0.03919 color rgbf <1.0000,1.0000,1.0000,0.1961>]
  [0.04006 color rgbf <1.0000,1.0000,1.0000,0.1980>]
  [0.04095 color rgbf <1.0000,1.0000,1.0000,0.2000>]
  [0.04095 color rgbf <1.0000,1.0000,1.0000,0.2039>]
  [0.04183 color rgbf <1.0000,1.0000,1.0000,0.2059>]
  [0.04272 color rgbf <1.0000,1.0000,1.0000,0.2078>]
  [0.04272 color rgbf <1.0000,1.0000,1.0000,0.2118>]
  [0.04362 color rgbf <1.0000,1.0000,1.0000,0.2137>]
  [0.04452 color rgbf <1.0000,1.0000,1.0000,0.2157>]
  [0.04452 color rgbf <1.0000,1.0000,1.0000,0.2196>]
  [0.04542 color rgbf <1.0000,1.0000,1.0000,0.2216>]
  [0.04633 color rgbf <1.0000,1.0000,1.0000,0.2235>]
  [0.04633 color rgbf <1.0000,1.0000,1.0000,0.2275>]
  [0.04724 color rgbf <1.0000,1.0000,1.0000,0.2294>]
  [0.04816 color rgbf <1.0000,1.0000,1.0000,0.2314>]
  [0.04816 color rgbf <1.0000,1.0000,1.0000,0.2353>]
  [0.04908 color rgbf <1.0000,1.0000,1.0000,0.2373>]
  [0.05001 color rgbf <1.0000,1.0000,1.0000,0.2392>]
  [0.05001 color rgbf <1.0000,1.0000,1.0000,0.2431>]
  [0.05094 color rgbf <1.0000,1.0000,1.0000,0.2451>]
  [0.05188 color rgbf <1.0000,1.0000,1.0000,0.2471>]
  [0.05188 color rgbf <1.0000,1.0000,1.0000,0.2510>]
  [0.05282 color rgbf <1.0000,1.0000,1.0000,0.2529>]
  [0.05377 color rgbf <1.0000,1.0000,1.0000,0.2549>]
  [0.05377 color rgbf <1.0000,1.0000,1.0000,0.2588>]
  [0.05472 color rgbf <1.0000,1.0000,1.0000,0.2608>]
  [0.05568 color rgbf <1.0000,1.0000,1.0000,0.2627>]
  [0.05568 color rgbf <1.0000,1.0000,1.0000,0.2667>]
  [0.05664 color rgbf <1.0000,1.0000,1.0000,0.2686>]
  [0.05761 color rgbf <1.0000,1.0000,1.0000,0.2706>]
  [0.05761 color rgbf <1.0000,1.0000,1.0000,0.2745>]
  [0.05858 color rgbf <1.0000,1.0000,1.0000,0.2765>]
  [0.05955 color rgbf <1.0000,1.0000,1.0000,0.2784>]
  [0.05955 color rgbf <1.0000,1.0000,1.0000,0.2824>]
  [0.06054 color rgbf <1.0000,1.0000,1.0000,0.2843>]
  [0.06153 color rgbf <1.0000,1.0000,1.0000,0.2863>]
  [0.06153 color rgbf <1.0000,1.0000,1.0000,0.2902>]
  [0.06252 color rgbf <1.0000,1.0000,1.0000,0.2922>]
  [0.06352 color rgbf <1.0000,1.0000,1.0000,0.2941>]
  [0.06352 color rgbf <1.0000,1.0000,1.0000,0.2980>]
  [0.06452 color rgbf <1.0000,1.0000,1.0000,0.3000>]
  [0.06553 color rgbf <1.0000,1.0000,1.0000,0.3020>]
  [0.06553 color rgbf <1.0000,1.0000,1.0000,0.3059>]
  [0.06655 color rgbf <1.0000,1.0000,1.0000,0.3078>]
  [0.06757 color rgbf <1.0000,1.0000,1.0000,0.3098>]
  [0.06757 color rgbf <1.0000,1.0000,1.0000,0.3137>]
  [0.06860 color rgbf <1.0000,1.0000,1.0000,0.3157>]
  [0.06963 color rgbf <1.0000,1.0000,1.0000,0.3176>]
  [0.06963 color rgbf <1.0000,1.0000,1.0000,0.3216>]
  [0.07067 color rgbf <1.0000,1.0000,1.0000,0.3235>]
  [0.07172 color rgbf <1.0000,1.0000,1.0000,0.3255>]
  [0.07172 color rgbf <1.0000,1.0000,1.0000,0.3294>]
  [0.07277 color rgbf <1.0000,1.0000,1.0000,0.3314>]
  [0.07383 color rgbf <1.0000,1.0000,1.0000,0.3333>]
  [0.07383 color rgbf <1.0000,1.0000,1.0000,0.3373>]
  [0.07489 color rgbf <1.0000,1.0000,1.0000,0.3392>]
  [0.07596 color rgbf <1.0000,1.0000,1.0000,0.3412>]
  [0.07596 color rgbf <1.0000,1.0000,1.0000,0.3451>]
  [0.07704 color rgbf <1.0000,1.0000,1.0000,0.3471>]
  [0.07812 color rgbf <1.0000,1.0000,1.0000,0.3490>]
  [0.07812 color rgbf <1.0000,1.0000,1.0000,0.3529>]
  [0.07921 color rgbf <1.0000,1.0000,1.0000,0.3549>]
  [0.08031 color rgbf <1.0000,1.0000,1.0000,0.3569>]
  [0.08031 color rgbf <1.0000,1.0000,1.0000,0.3608>]
  [0.08141 color rgbf <1.0000,1.0000,1.0000,0.3627>]
  [0.08252 color rgbf <1.0000,1.0000,1.0000,0.3647>]
  [0.08252 color rgbf <1.0000,1.0000,1.0000,0.3686>]
  [0.08364 color rgbf <1.0000,1.0000,1.0000,0.3706>]
  [0.08476 color rgbf <1.0000,1.0000,1.0000,0.3725>]
  [0.08476 color rgbf <1.0000,1.0000,1.0000,0.3765>]
  [0.08589 color rgbf <1.0000,1.0000,1.0000,0.3784>]
  [0.08703 color rgbf <1.0000,1.0000,1.0000,0.3804>]
  [0.08703 color rgbf <1.0000,1.0000,1.0000,0.3843>]
  [0.08817 color rgbf <1.0000,1.0000,1.0000,0.3863>]
  [0.08932 color rgbf <1.0000,1.0000,1.0000,0.3882>]
  [0.08932 color rgbf <1.0000,1.0000,1.0000,0.3922>]
  [0.09048 color rgbf <1.0000,1.0000,1.0000,0.3941>]
  [0.09165 color rgbf <1.0000,1.0000,1.0000,0.3961>]
  [0.09165 color rgbf <1.0000,1.0000,1.0000,0.4000>]
  [0.09283 color rgbf <1.0000,1.0000,1.0000,0.4020>]
  [0.09401 color rgbf <1.0000,1.0000,1.0000,0.4039>]
  [0.09401 color rgbf <1.0000,1.0000,1.0000,0.4078>]
  [0.09520 color rgbf <1.0000,1.0000,1.0000,0.4098>]
  [0.09640 color rgbf <1.0000,1.0000,1.0000,0.4118>]
  [0.09640 color rgbf <1.0000,1.0000,1.0000,0.4157>]
  [0.09760 color rgbf <1.0000,1.0000,1.0000,0.4176>]
  [0.09882 color rgbf <1.0000,1.0000,1.0000,0.4196>]
  [0.09882 color rgbf <1.0000,1.0000,1.0000,0.4235>]
  [0.10004 color rgbf <1.0000,1.0000,1.0000,0.4255>]
  [0.10127 color rgbf <1.0000,1.0000,1.0000,0.4275>]
  [0.10127 color rgbf <1.0000,1.0000,1.0000,0.4314>]
  [0.10251 color rgbf <1.0000,1.0000,1.0000,0.4333>]
  [0.10376 color rgbf <1.0000,1.0000,1.0000,0.4353>]
  [0.10376 color rgbf <1.0000,1.0000,1.0000,0.4392>]
  [0.10502 color rgbf <1.0000,1.0000,1.0000,0.4412>]
  [0.10628 color rgbf <1.0000,1.0000,1.0000,0.4431>]
  [0.10628 color rgbf <1.0000,1.0000,1.0000,0.4471>]
  [0.10756 color rgbf <1.0000,1.0000,1.0000,0.4490>]
  [0.10884 color rgbf <1.0000,1.0000,1.0000,0.4510>]
  [0.10884 color rgbf <1.0000,1.0000,1.0000,0.4549>]
  [0.11013 color rgbf <1.0000,1.0000,1.0000,0.4569>]
  [0.11143 color rgbf <1.0000,1.0000,1.0000,0.4588>]
  [0.11143 color rgbf <1.0000,1.0000,1.0000,0.4627>]
  [0.11275 color rgbf <1.0000,1.0000,1.0000,0.4647>]
  [0.11407 color rgbf <1.0000,1.0000,1.0000,0.4667>]
  [0.11407 color rgbf <1.0000,1.0000,1.0000,0.4706>]
  [0.11540 color rgbf <1.0000,1.0000,1.0000,0.4725>]
  [0.11674 color rgbf <1.0000,1.0000,1.0000,0.4745>]
  [0.11674 color rgbf <1.0000,1.0000,1.0000,0.4784>]
  [0.11809 color rgbf <1.0000,1.0000,1.0000,0.4804>]
  [0.11945 color rgbf <1.0000,1.0000,1.0000,0.4824>]
  [0.11945 color rgbf <1.0000,1.0000,1.0000,0.4863>]
  [0.12082 color rgbf <1.0000,1.0000,1.0000,0.4882>]
  [0.12220 color rgbf <1.0000,1.0000,1.0000,0.4902>]
  [0.12220 color rgbf <1.0000,1.0000,1.0000,0.4941>]
  [0.12360 color rgbf <1.0000,1.0000,1.0000,0.4961>]
  [0.12500 color rgbf <1.0000,1.0000,1.0000,0.4980>]
  [0.12500 color rgbf <1.0000,1.0000,1.0000,0.5020>]
  [0.12641 color rgbf <1.0000,1.0000,1.0000,0.5039>]
  [0.12784 color rgbf <1.0000,1.0000,1.0000,0.5059>]
  [0.12784 color rgbf <1.0000,1.0000,1.0000,0.5098>]
  [0.12928 color rgbf <1.0000,1.0000,1.0000,0.5118>]
  [0.13073 color rgbf <1.0000,1.0000,1.0000,0.5137>]
  [0.13073 color rgbf <1.0000,1.0000,1.0000,0.5176>]
  [0.13219 color rgbf <1.0000,1.0000,1.0000,0.5196>]
  [0.13366 color rgbf <1.0000,1.0000,1.0000,0.5216>]
  [0.13366 color rgbf <1.0000,1.0000,1.0000,0.5255>]
  [0.13514 color rgbf <1.0000,1.0000,1.0000,0.5275>]
  [0.13664 color rgbf <1.0000,1.0000,1.0000,0.5294>]
  [0.13664 color rgbf <1.0000,1.0000,1.0000,0.5333>]
  [0.13815 color rgbf <1.0000,1.0000,1.0000,0.5353>]
  [0.13967 color rgbf <1.0000,1.0000,1.0000,0.5373>]
  [0.13967 color rgbf <1.0000,1.0000,1.0000,0.5412>]
  [0.14120 color rgbf <1.0000,1.0000,1.0000,0.5431>]
  [0.14275 color rgbf <1.0000,1.0000,1.0000,0.5451>]
  [0.14275 color rgbf <1.0000,1.0000,1.0000,0.5490>]
  [0.14431 color rgbf <1.0000,1.0000,1.0000,0.5510>]
  [0.14589 color rgbf <1.0000,1.0000,1.0000,0.5529>]
  [0.14589 color rgbf <1.0000,1.0000,1.0000,0.5569>]
  [0.14748 color rgbf <1.0000,1.0000,1.0000,0.5588>]
  [0.14908 color rgbf <1.0000,1.0000,1.0000,0.5608>]
  [0.14908 color rgbf <1.0000,1.0000,1.0000,0.5647>]
  [0.15070 color rgbf <1.0000,1.0000,1.0000,0.5667>]
  [0.15233 color rgbf <1.0000,1.0000,1.0000,0.5686>]
  [0.15233 color rgbf <1.0000,1.0000,1.0000,0.5725>]
  [0.15398 color rgbf <1.0000,1.0000,1.0000,0.5745>]
  [0.15564 color rgbf <1.0000,1.0000,1.0000,0.5765>]
  [0.15564 color rgbf <1.0000,1.0000,1.0000,0.5804>]
  [0.15732 color rgbf <1.0000,1.0000,1.0000,0.5824>]
  [0.15901 color rgbf <1.0000,1.0000,1.0000,0.5843>]
  [0.15901 color rgbf <1.0000,1.0000,1.0000,0.5882>]
  [0.16072 color rgbf <1.0000,1.0000,1.0000,0.5902>]
  [0.16244 color rgbf <1.0000,1.0000,1.0000,0.5922>]
  [0.16244 color rgbf <1.0000,1.0000,1.0000,0.5961>]
  [0.16419 color rgbf <1.0000,1.0000,1.0000,0.5980>]
  [0.16595 color rgbf <1.0000,1.0000,1.0000,0.6000>]
  [0.16595 color rgbf <1.0000,1.0000,1.0000,0.6039>]
  [0.16772 color rgbf <1.0000,1.0000,1.0000,0.6059>]
  [0.16952 color rgbf <1.0000,1.0000,1.0000,0.6078>]
  [0.16952 color rgbf <1.0000,1.0000,1.0000,0.6118>]
  [0.17133 color rgbf <1.0000,1.0000,1.0000,0.6137>]
  [0.17316 color rgbf <1.0000,1.0000,1.0000,0.6157>]
  [0.17316 color rgbf <1.0000,1.0000,1.0000,0.6196>]
  [0.17501 color rgbf <1.0000,1.0000,1.0000,0.6216>]
  [0.17688 color rgbf <1.0000,1.0000,1.0000,0.6235>]
  [0.17688 color rgbf <1.0000,1.0000,1.0000,0.6275>]
  [0.17877 color rgbf <1.0000,1.0000,1.0000,0.6294>]
  [0.18068 color rgbf <1.0000,1.0000,1.0000,0.6314>]
  [0.18068 color rgbf <1.0000,1.0000,1.0000,0.6353>]
  [0.18261 color rgbf <1.0000,1.0000,1.0000,0.6373>]
  [0.18455 color rgbf <1.0000,1.0000,1.0000,0.6392>]
  [0.18455 color rgbf <1.0000,1.0000,1.0000,0.6431>]
  [0.18653 color rgbf <1.0000,1.0000,1.0000,0.6451>]
  [0.18852 color rgbf <1.0000,1.0000,1.0000,0.6471>]
  [0.18852 color rgbf <1.0000,1.0000,1.0000,0.6510>]
  [0.19053 color rgbf <1.0000,1.0000,1.0000,0.6529>]
  [0.19257 color rgbf <1.0000,1.0000,1.0000,0.6549>]
  [0.19257 color rgbf <1.0000,1.0000,1.0000,0.6588>]
  [0.19463 color rgbf <1.0000,1.0000,1.0000,0.6608>]
  [0.19672 color rgbf <1.0000,1.0000,1.0000,0.6627>]
  [0.19672 color rgbf <1.0000,1.0000,1.0000,0.6667>]
  [0.19883 color rgbf <1.0000,1.0000,1.0000,0.6686>]
  [0.20096 color rgbf <1.0000,1.0000,1.0000,0.6706>]
  [0.20096 color rgbf <1.0000,1.0000,1.0000,0.6745>]
  [0.20312 color rgbf <1.0000,1.0000,1.0000,0.6765>]
  [0.20531 color rgbf <1.0000,1.0000,1.0000,0.6784>]
  [0.20531 color rgbf <1.0000,1.0000,1.0000,0.6824>]
  [0.20752 color rgbf <1.0000,1.0000,1.0000,0.6843>]
  [0.20976 color rgbf <1.0000,1.0000,1.0000,0.6863>]
  [0.20976 color rgbf <1.0000,1.0000,1.0000,0.6902>]
  [0.21203 color rgbf <1.0000,1.0000,1.0000,0.6922>]
  [0.21433 color rgbf <1.0000,1.0000,1.0000,0.6941>]
  [0.21433 color rgbf <1.0000,1.0000,1.0000,0.6980>]
  [0.21665 color rgbf <1.0000,1.0000,1.0000,0.7000>]
  [0.21901 color rgbf <1.0000,1.0000,1.0000,0.7020>]
  [0.21901 color rgbf <1.0000,1.0000,1.0000,0.7059>]
  [0.22140 color rgbf <1.0000,1.0000,1.0000,0.7078>]
  [0.22382 color rgbf <1.0000,1.0000,1.0000,0.7098>]
  [0.22382 color rgbf <1.0000,1.0000,1.0000,0.7137>]
  [0.22627 color rgbf <1.0000,1.0000,1.0000,0.7157>]
  [0.22876 color rgbf <1.0000,1.0000,1.0000,0.7176>]
  [0.22876 color rgbf <1.0000,1.0000,1.0000,0.7216>]
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