// cpt-city: tl/power-1.50 (ggr)
//
// Nonlinear greyscales
//
// author: Thomas Lotze
// copyright: Free to use
// year: 2004
// url: https://phillips.shef.ac.uk/pub/cpt-city/tl
#declare power_1_50 =
color_map {
  [0.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.00262 color rgbf <1.0000,1.0000,1.0000,0.0020>]
  [0.00524 color rgbf <1.0000,1.0000,1.0000,0.0039>]
  [0.00524 color rgbf <1.0000,1.0000,1.0000,0.0078>]
  [0.00786 color rgbf <1.0000,1.0000,1.0000,0.0098>]
  [0.01048 color rgbf <1.0000,1.0000,1.0000,0.0118>]
  [0.01048 color rgbf <1.0000,1.0000,1.0000,0.0157>]
  [0.01312 color rgbf <1.0000,1.0000,1.0000,0.0176>]
  [0.01575 color rgbf <1.0000,1.0000,1.0000,0.0196>]
  [0.01575 color rgbf <1.0000,1.0000,1.0000,0.0235>]
  [0.01838 color rgbf <1.0000,1.0000,1.0000,0.0255>]
  [0.02103 color rgbf <1.0000,1.0000,1.0000,0.0275>]
  [0.02103 color rgbf <1.0000,1.0000,1.0000,0.0314>]
  [0.02367 color rgbf <1.0000,1.0000,1.0000,0.0333>]
  [0.02632 color rgbf <1.0000,1.0000,1.0000,0.0353>]
  [0.02632 color rgbf <1.0000,1.0000,1.0000,0.0392>]
  [0.02897 color rgbf <1.0000,1.0000,1.0000,0.0412>]
  [0.03162 color rgbf <1.0000,1.0000,1.0000,0.0431>]
  [0.03162 color rgbf <1.0000,1.0000,1.0000,0.0471>]
  [0.03428 color rgbf <1.0000,1.0000,1.0000,0.0490>]
  [0.03694 color rgbf <1.0000,1.0000,1.0000,0.0510>]
  [0.03694 color rgbf <1.0000,1.0000,1.0000,0.0549>]
  [0.03961 color rgbf <1.0000,1.0000,1.0000,0.0569>]
  [0.04228 color rgbf <1.0000,1.0000,1.0000,0.0588>]
  [0.04228 color rgbf <1.0000,1.0000,1.0000,0.0627>]
  [0.04495 color rgbf <1.0000,1.0000,1.0000,0.0647>]
  [0.04763 color rgbf <1.0000,1.0000,1.0000,0.0667>]
  [0.04763 color rgbf <1.0000,1.0000,1.0000,0.0706>]
  [0.05031 color rgbf <1.0000,1.0000,1.0000,0.0725>]
  [0.05300 color rgbf <1.0000,1.0000,1.0000,0.0745>]
  [0.05300 color rgbf <1.0000,1.0000,1.0000,0.0784>]
  [0.05569 color rgbf <1.0000,1.0000,1.0000,0.0804>]
  [0.05838 color rgbf <1.0000,1.0000,1.0000,0.0824>]
  [0.05838 color rgbf <1.0000,1.0000,1.0000,0.0863>]
  [0.06107 color rgbf <1.0000,1.0000,1.0000,0.0882>]
  [0.06377 color rgbf <1.0000,1.0000,1.0000,0.0902>]
  [0.06377 color rgbf <1.0000,1.0000,1.0000,0.0941>]
  [0.06648 color rgbf <1.0000,1.0000,1.0000,0.0961>]
  [0.06918 color rgbf <1.0000,1.0000,1.0000,0.0980>]
  [0.06918 color rgbf <1.0000,1.0000,1.0000,0.1020>]
  [0.07190 color rgbf <1.0000,1.0000,1.0000,0.1039>]
  [0.07461 color rgbf <1.0000,1.0000,1.0000,0.1059>]
  [0.07461 color rgbf <1.0000,1.0000,1.0000,0.1098>]
  [0.07733 color rgbf <1.0000,1.0000,1.0000,0.1118>]
  [0.08006 color rgbf <1.0000,1.0000,1.0000,0.1137>]
  [0.08006 color rgbf <1.0000,1.0000,1.0000,0.1176>]
  [0.08278 color rgbf <1.0000,1.0000,1.0000,0.1196>]
  [0.08552 color rgbf <1.0000,1.0000,1.0000,0.1216>]
  [0.08552 color rgbf <1.0000,1.0000,1.0000,0.1255>]
  [0.08825 color rgbf <1.0000,1.0000,1.0000,0.1275>]
  [0.09099 color rgbf <1.0000,1.0000,1.0000,0.1294>]
  [0.09099 color rgbf <1.0000,1.0000,1.0000,0.1333>]
  [0.09373 color rgbf <1.0000,1.0000,1.0000,0.1353>]
  [0.09648 color rgbf <1.0000,1.0000,1.0000,0.1373>]
  [0.09648 color rgbf <1.0000,1.0000,1.0000,0.1412>]
  [0.09924 color rgbf <1.0000,1.0000,1.0000,0.1431>]
  [0.10199 color rgbf <1.0000,1.0000,1.0000,0.1451>]
  [0.10199 color rgbf <1.0000,1.0000,1.0000,0.1490>]
  [0.10475 color rgbf <1.0000,1.0000,1.0000,0.1510>]
  [0.10752 color rgbf <1.0000,1.0000,1.0000,0.1529>]
  [0.10752 color rgbf <1.0000,1.0000,1.0000,0.1569>]
  [0.11029 color rgbf <1.0000,1.0000,1.0000,0.1588>]
  [0.11306 color rgbf <1.0000,1.0000,1.0000,0.1608>]
  [0.11306 color rgbf <1.0000,1.0000,1.0000,0.1647>]
  [0.11584 color rgbf <1.0000,1.0000,1.0000,0.1667>]
  [0.11862 color rgbf <1.0000,1.0000,1.0000,0.1686>]
  [0.11862 color rgbf <1.0000,1.0000,1.0000,0.1725>]
  [0.12141 color rgbf <1.0000,1.0000,1.0000,0.1745>]
  [0.12420 color rgbf <1.0000,1.0000,1.0000,0.1765>]
  [0.12420 color rgbf <1.0000,1.0000,1.0000,0.1804>]
  [0.12700 color rgbf <1.0000,1.0000,1.0000,0.1824>]
  [0.12980 color rgbf <1.0000,1.0000,1.0000,0.1843>]
  [0.12980 color rgbf <1.0000,1.0000,1.0000,0.1882>]
  [0.13260 color rgbf <1.0000,1.0000,1.0000,0.1902>]
  [0.13541 color rgbf <1.0000,1.0000,1.0000,0.1922>]
  [0.13541 color rgbf <1.0000,1.0000,1.0000,0.1961>]
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  [0.16091 color rgbf <1.0000,1.0000,1.0000,0.2294>]
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  [0.16662 color rgbf <1.0000,1.0000,1.0000,0.2373>]
  [0.16949 color rgbf <1.0000,1.0000,1.0000,0.2392>]
  [0.16949 color rgbf <1.0000,1.0000,1.0000,0.2431>]
  [0.17236 color rgbf <1.0000,1.0000,1.0000,0.2451>]
  [0.17524 color rgbf <1.0000,1.0000,1.0000,0.2471>]
  [0.17524 color rgbf <1.0000,1.0000,1.0000,0.2510>]
  [0.17812 color rgbf <1.0000,1.0000,1.0000,0.2529>]
  [0.18100 color rgbf <1.0000,1.0000,1.0000,0.2549>]
  [0.18100 color rgbf <1.0000,1.0000,1.0000,0.2588>]
  [0.18390 color rgbf <1.0000,1.0000,1.0000,0.2608>]
  [0.18679 color rgbf <1.0000,1.0000,1.0000,0.2627>]
  [0.18679 color rgbf <1.0000,1.0000,1.0000,0.2667>]
  [0.18970 color rgbf <1.0000,1.0000,1.0000,0.2686>]
  [0.19260 color rgbf <1.0000,1.0000,1.0000,0.2706>]
  [0.19260 color rgbf <1.0000,1.0000,1.0000,0.2745>]
  [0.19551 color rgbf <1.0000,1.0000,1.0000,0.2765>]
  [0.19843 color rgbf <1.0000,1.0000,1.0000,0.2784>]
  [0.19843 color rgbf <1.0000,1.0000,1.0000,0.2824>]
  [0.20135 color rgbf <1.0000,1.0000,1.0000,0.2843>]
  [0.20428 color rgbf <1.0000,1.0000,1.0000,0.2863>]
  [0.20428 color rgbf <1.0000,1.0000,1.0000,0.2902>]
  [0.20722 color rgbf <1.0000,1.0000,1.0000,0.2922>]
  [0.21015 color rgbf <1.0000,1.0000,1.0000,0.2941>]
  [0.21015 color rgbf <1.0000,1.0000,1.0000,0.2980>]
  [0.21310 color rgbf <1.0000,1.0000,1.0000,0.3000>]
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