// cpt-city: tl/power-0.50 (ggr)
//
// Nonlinear greyscales
//
// author: Thomas Lotze
// copyright: Free to use
// year: 2004
// url: https://phillips.shef.ac.uk/pub/cpt-city/tl
#declare power_0_50 =
color_map {
  [0.00000 color rgbf <1.0000,1.0000,1.0000,0.0000>]
  [0.00783 color rgbf <1.0000,1.0000,1.0000,0.0020>]
  [0.01562 color rgbf <1.0000,1.0000,1.0000,0.0039>]
  [0.01562 color rgbf <1.0000,1.0000,1.0000,0.0078>]
  [0.02339 color rgbf <1.0000,1.0000,1.0000,0.0098>]
  [0.03113 color rgbf <1.0000,1.0000,1.0000,0.0118>]
  [0.03113 color rgbf <1.0000,1.0000,1.0000,0.0157>]
  [0.03883 color rgbf <1.0000,1.0000,1.0000,0.0176>]
  [0.04650 color rgbf <1.0000,1.0000,1.0000,0.0196>]
  [0.04650 color rgbf <1.0000,1.0000,1.0000,0.0235>]
  [0.05415 color rgbf <1.0000,1.0000,1.0000,0.0255>]
  [0.06176 color rgbf <1.0000,1.0000,1.0000,0.0275>]
  [0.06176 color rgbf <1.0000,1.0000,1.0000,0.0314>]
  [0.06934 color rgbf <1.0000,1.0000,1.0000,0.0333>]
  [0.07689 color rgbf <1.0000,1.0000,1.0000,0.0353>]
  [0.07689 color rgbf <1.0000,1.0000,1.0000,0.0392>]
  [0.08441 color rgbf <1.0000,1.0000,1.0000,0.0412>]
  [0.09190 color rgbf <1.0000,1.0000,1.0000,0.0431>]
  [0.09190 color rgbf <1.0000,1.0000,1.0000,0.0471>]
  [0.09936 color rgbf <1.0000,1.0000,1.0000,0.0490>]
  [0.10679 color rgbf <1.0000,1.0000,1.0000,0.0510>]
  [0.10679 color rgbf <1.0000,1.0000,1.0000,0.0549>]
  [0.11419 color rgbf <1.0000,1.0000,1.0000,0.0569>]
  [0.12155 color rgbf <1.0000,1.0000,1.0000,0.0588>]
  [0.12155 color rgbf <1.0000,1.0000,1.0000,0.0627>]
  [0.12889 color rgbf <1.0000,1.0000,1.0000,0.0647>]
  [0.13619 color rgbf <1.0000,1.0000,1.0000,0.0667>]
  [0.13619 color rgbf <1.0000,1.0000,1.0000,0.0706>]
  [0.14347 color rgbf <1.0000,1.0000,1.0000,0.0725>]
  [0.15071 color rgbf <1.0000,1.0000,1.0000,0.0745>]
  [0.15071 color rgbf <1.0000,1.0000,1.0000,0.0784>]
  [0.15792 color rgbf <1.0000,1.0000,1.0000,0.0804>]
  [0.16511 color rgbf <1.0000,1.0000,1.0000,0.0824>]
  [0.16511 color rgbf <1.0000,1.0000,1.0000,0.0863>]
  [0.17226 color rgbf <1.0000,1.0000,1.0000,0.0882>]
  [0.17938 color rgbf <1.0000,1.0000,1.0000,0.0902>]
  [0.17938 color rgbf <1.0000,1.0000,1.0000,0.0941>]
  [0.18647 color rgbf <1.0000,1.0000,1.0000,0.0961>]
  [0.19353 color rgbf <1.0000,1.0000,1.0000,0.0980>]
  [0.19353 color rgbf <1.0000,1.0000,1.0000,0.1020>]
  [0.20055 color rgbf <1.0000,1.0000,1.0000,0.1039>]
  [0.20755 color rgbf <1.0000,1.0000,1.0000,0.1059>]
  [0.20755 color rgbf <1.0000,1.0000,1.0000,0.1098>]
  [0.21452 color rgbf <1.0000,1.0000,1.0000,0.1118>]
  [0.22145 color rgbf <1.0000,1.0000,1.0000,0.1137>]
  [0.22145 color rgbf <1.0000,1.0000,1.0000,0.1176>]
  [0.22836 color rgbf <1.0000,1.0000,1.0000,0.1196>]
  [0.23523 color rgbf <1.0000,1.0000,1.0000,0.1216>]
  [0.23523 color rgbf <1.0000,1.0000,1.0000,0.1255>]
  [0.24208 color rgbf <1.0000,1.0000,1.0000,0.1275>]
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  [0.25567 color rgbf <1.0000,1.0000,1.0000,0.1353>]
  [0.26242 color rgbf <1.0000,1.0000,1.0000,0.1373>]
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  [0.28249 color rgbf <1.0000,1.0000,1.0000,0.1510>]
  [0.28912 color rgbf <1.0000,1.0000,1.0000,0.1529>]
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  [0.29572 color rgbf <1.0000,1.0000,1.0000,0.1588>]
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  [0.32180 color rgbf <1.0000,1.0000,1.0000,0.1745>]
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  [0.33466 color rgbf <1.0000,1.0000,1.0000,0.1824>]
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  [0.47366 color rgbf <1.0000,1.0000,1.0000,0.2745>]
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