/*
  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
*/
linear-gradient(
  0deg,
  rgb(255, 255, 255)   0.000%,
  rgba(255, 255, 255, 0.998)   0.071%,
  rgba(255, 255, 255, 0.996)   0.141%,
  rgba(255, 255, 255, 0.992)   0.141%,
  rgba(255, 255, 255, 0.990)   0.213%,
  rgba(255, 255, 255, 0.988)   0.284%,
  rgba(255, 255, 255, 0.984)   0.284%,
  rgba(255, 255, 255, 0.982)   0.356%,
  rgba(255, 255, 255, 0.980)   0.428%,
  rgba(255, 255, 255, 0.977)   0.428%,
  rgba(255, 255, 255, 0.975)   0.500%,
  rgba(255, 255, 255, 0.973)   0.573%,
  rgba(255, 255, 255, 0.969)   0.573%,
  rgba(255, 255, 255, 0.967)   0.645%,
  rgba(255, 255, 255, 0.965)   0.719%,
  rgba(255, 255, 255, 0.961)   0.719%,
  rgba(255, 255, 255, 0.959)   0.792%,
  rgba(255, 255, 255, 0.957)   0.866%,
  rgba(255, 255, 255, 0.953)   0.866%,
  rgba(255, 255, 255, 0.951)   0.940%,
  rgba(255, 255, 255, 0.949)   1.014%,
  rgba(255, 255, 255, 0.945)   1.014%,
  rgba(255, 255, 255, 0.943)   1.089%,
  rgba(255, 255, 255, 0.941)   1.164%,
  rgba(255, 255, 255, 0.937)   1.164%,
  rgba(255, 255, 255, 0.935)   1.239%,
  rgba(255, 255, 255, 0.933)   1.315%,
  rgba(255, 255, 255, 0.929)   1.315%,
  rgba(255, 255, 255, 0.927)   1.391%,
  rgba(255, 255, 255, 0.925)   1.467%,
  rgba(255, 255, 255, 0.922)   1.467%,
  rgba(255, 255, 255, 0.920)   1.544%,
  rgba(255, 255, 255, 0.918)   1.620%,
  rgba(255, 255, 255, 0.914)   1.620%,
  rgba(255, 255, 255, 0.912)   1.698%,
  rgba(255, 255, 255, 0.910)   1.775%,
  rgba(255, 255, 255, 0.906)   1.775%,
  rgba(255, 255, 255, 0.904)   1.853%,
  rgba(255, 255, 255, 0.902)   1.931%,
  rgba(255, 255, 255, 0.898)   1.931%,
  rgba(255, 255, 255, 0.896)   2.010%,
  rgba(255, 255, 255, 0.894)   2.089%,
  rgba(255, 255, 255, 0.890)   2.089%,
  rgba(255, 255, 255, 0.888)   2.168%,
  rgba(255, 255, 255, 0.886)   2.248%,
  rgba(255, 255, 255, 0.882)   2.248%,
  rgba(255, 255, 255, 0.880)   2.328%,
  rgba(255, 255, 255, 0.878)   2.408%,
  rgba(255, 255, 255, 0.875)   2.408%,
  rgba(255, 255, 255, 0.873)   2.489%,
  rgba(255, 255, 255, 0.871)   2.570%,
  rgba(255, 255, 255, 0.867)   2.570%,
  rgba(255, 255, 255, 0.865)   2.651%,
  rgba(255, 255, 255, 0.863)   2.733%,
  rgba(255, 255, 255, 0.859)   2.733%,
  rgba(255, 255, 255, 0.857)   2.815%,
  rgba(255, 255, 255, 0.855)   2.898%,
  rgba(255, 255, 255, 0.851)   2.898%,
  rgba(255, 255, 255, 0.849)   2.981%,
  rgba(255, 255, 255, 0.847)   3.064%,
  rgba(255, 255, 255, 0.843)   3.064%,
  rgba(255, 255, 255, 0.841)   3.148%,
  rgba(255, 255, 255, 0.839)   3.232%,
  rgba(255, 255, 255, 0.835)   3.232%,
  rgba(255, 255, 255, 0.833)   3.316%,
  rgba(255, 255, 255, 0.831)   3.401%,
  rgba(255, 255, 255, 0.828)   3.401%,
  rgba(255, 255, 255, 0.826)   3.486%,
  rgba(255, 255, 255, 0.824)   3.572%,
  rgba(255, 255, 255, 0.820)   3.572%,
  rgba(255, 255, 255, 0.818)   3.658%,
  rgba(255, 255, 255, 0.816)   3.744%,
  rgba(255, 255, 255, 0.812)   3.744%,
  rgba(255, 255, 255, 0.810)   3.831%,
  rgba(255, 255, 255, 0.808)   3.919%,
  rgba(255, 255, 255, 0.804)   3.919%,
  rgba(255, 255, 255, 0.802)   4.006%,
  rgba(255, 255, 255, 0.800)   4.095%,
  rgba(255, 255, 255, 0.796)   4.095%,
  rgba(255, 255, 255, 0.794)   4.183%,
  rgba(255, 255, 255, 0.792)   4.272%,
  rgba(255, 255, 255, 0.788)   4.272%,
  rgba(255, 255, 255, 0.786)   4.362%,
  rgba(255, 255, 255, 0.784)   4.452%,
  rgba(255, 255, 255, 0.780)   4.452%,
  rgba(255, 255, 255, 0.778)   4.542%,
  rgba(255, 255, 255, 0.776)   4.633%,
  rgba(255, 255, 255, 0.772)   4.633%,
  rgba(255, 255, 255, 0.771)   4.724%,
  rgba(255, 255, 255, 0.769)   4.816%,
  rgba(255, 255, 255, 0.765)   4.816%,
  rgba(255, 255, 255, 0.763)   4.908%,
  rgba(255, 255, 255, 0.761)   5.001%,
  rgba(255, 255, 255, 0.757)   5.001%,
  rgba(255, 255, 255, 0.755)   5.094%,
  rgba(255, 255, 255, 0.753)   5.188%,
  rgba(255, 255, 255, 0.749)   5.188%,
  rgba(255, 255, 255, 0.747)   5.282%,
  rgba(255, 255, 255, 0.745)   5.377%,
  rgba(255, 255, 255, 0.741)   5.377%,
  rgba(255, 255, 255, 0.739)   5.472%,
  rgba(255, 255, 255, 0.737)   5.568%,
  rgba(255, 255, 255, 0.733)   5.568%,
  rgba(255, 255, 255, 0.731)   5.664%,
  rgba(255, 255, 255, 0.729)   5.761%,
  rgba(255, 255, 255, 0.726)   5.761%,
  rgba(255, 255, 255, 0.724)   5.858%,
  rgba(255, 255, 255, 0.722)   5.955%,
  rgba(255, 255, 255, 0.718)   5.955%,
  rgba(255, 255, 255, 0.716)   6.054%,
  rgba(255, 255, 255, 0.714)   6.153%,
  rgba(255, 255, 255, 0.710)   6.153%,
  rgba(255, 255, 255, 0.708)   6.252%,
  rgba(255, 255, 255, 0.706)   6.352%,
  rgba(255, 255, 255, 0.702)   6.352%,
  rgba(255, 255, 255, 0.700)   6.452%,
  rgba(255, 255, 255, 0.698)   6.553%,
  rgba(255, 255, 255, 0.694)   6.553%,
  rgba(255, 255, 255, 0.692)   6.655%,
  rgba(255, 255, 255, 0.690)   6.757%,
  rgba(255, 255, 255, 0.686)   6.757%,
  rgba(255, 255, 255, 0.684)   6.860%,
  rgba(255, 255, 255, 0.682)   6.963%,
  rgba(255, 255, 255, 0.678)   6.963%,
  rgba(255, 255, 255, 0.676)   7.067%,
  rgba(255, 255, 255, 0.674)   7.172%,
  rgba(255, 255, 255, 0.671)   7.172%,
  rgba(255, 255, 255, 0.669)   7.277%,
  rgba(255, 255, 255, 0.667)   7.383%,
  rgba(255, 255, 255, 0.663)   7.383%,
  rgba(255, 255, 255, 0.661)   7.489%,
  rgba(255, 255, 255, 0.659)   7.596%,
  rgba(255, 255, 255, 0.655)   7.596%,
  rgba(255, 255, 255, 0.653)   7.704%,
  rgba(255, 255, 255, 0.651)   7.812%,
  rgba(255, 255, 255, 0.647)   7.812%,
  rgba(255, 255, 255, 0.645)   7.921%,
  rgba(255, 255, 255, 0.643)   8.031%,
  rgba(255, 255, 255, 0.639)   8.031%,
  rgba(255, 255, 255, 0.637)   8.141%,
  rgba(255, 255, 255, 0.635)   8.252%,
  rgba(255, 255, 255, 0.631)   8.252%,
  rgba(255, 255, 255, 0.629)   8.364%,
  rgba(255, 255, 255, 0.627)   8.476%,
  rgba(255, 255, 255, 0.624)   8.476%,
  rgba(255, 255, 255, 0.622)   8.589%,
  rgba(255, 255, 255, 0.620)   8.703%,
  rgba(255, 255, 255, 0.616)   8.703%,
  rgba(255, 255, 255, 0.614)   8.817%,
  rgba(255, 255, 255, 0.612)   8.932%,
  rgba(255, 255, 255, 0.608)   8.932%,
  rgba(255, 255, 255, 0.606)   9.048%,
  rgba(255, 255, 255, 0.604)   9.165%,
  rgba(255, 255, 255, 0.600)   9.165%,
  rgba(255, 255, 255, 0.598)   9.283%,
  rgba(255, 255, 255, 0.596)   9.401%,
  rgba(255, 255, 255, 0.592)   9.401%,
  rgba(255, 255, 255, 0.590)   9.520%,
  rgba(255, 255, 255, 0.588)   9.640%,
  rgba(255, 255, 255, 0.584)   9.640%,
  rgba(255, 255, 255, 0.582)   9.760%,
  rgba(255, 255, 255, 0.580)   9.882%,
  rgba(255, 255, 255, 0.577)   9.882%,
  rgba(255, 255, 255, 0.575)  10.004%,
  rgba(255, 255, 255, 0.573)  10.127%,
  rgba(255, 255, 255, 0.569)  10.127%,
  rgba(255, 255, 255, 0.567)  10.251%,
  rgba(255, 255, 255, 0.565)  10.376%,
  rgba(255, 255, 255, 0.561)  10.376%,
  rgba(255, 255, 255, 0.559)  10.502%,
  rgba(255, 255, 255, 0.557)  10.628%,
  rgba(255, 255, 255, 0.553)  10.628%,
  rgba(255, 255, 255, 0.551)  10.756%,
  rgba(255, 255, 255, 0.549)  10.884%,
  rgba(255, 255, 255, 0.545)  10.884%,
  rgba(255, 255, 255, 0.543)  11.013%,
  rgba(255, 255, 255, 0.541)  11.143%,
  rgba(255, 255, 255, 0.537)  11.143%,
  rgba(255, 255, 255, 0.535)  11.275%,
  rgba(255, 255, 255, 0.533)  11.407%,
  rgba(255, 255, 255, 0.529)  11.407%,
  rgba(255, 255, 255, 0.527)  11.540%,
  rgba(255, 255, 255, 0.525)  11.674%,
  rgba(255, 255, 255, 0.522)  11.674%,
  rgba(255, 255, 255, 0.520)  11.809%,
  rgba(255, 255, 255, 0.518)  11.945%,
  rgba(255, 255, 255, 0.514)  11.945%,
  rgba(255, 255, 255, 0.512)  12.082%,
  rgba(255, 255, 255, 0.510)  12.220%,
  rgba(255, 255, 255, 0.506)  12.220%,
  rgba(255, 255, 255, 0.504)  12.360%,
  rgba(255, 255, 255, 0.502)  12.500%,
  rgba(255, 255, 255, 0.498)  12.500%,
  rgba(255, 255, 255, 0.496)  12.641%,
  rgba(255, 255, 255, 0.494)  12.784%,
  rgba(255, 255, 255, 0.490)  12.784%,
  rgba(255, 255, 255, 0.488)  12.928%,
  rgba(255, 255, 255, 0.486)  13.072%,
  rgba(255, 255, 255, 0.482)  13.072%,
  rgba(255, 255, 255, 0.480)  13.219%,
  rgba(255, 255, 255, 0.478)  13.366%,
  rgba(255, 255, 255, 0.474)  13.366%,
  rgba(255, 255, 255, 0.472)  13.514%,
  rgba(255, 255, 255, 0.471)  13.664%,
  rgba(255, 255, 255, 0.467)  13.664%,
  rgba(255, 255, 255, 0.465)  13.815%,
  rgba(255, 255, 255, 0.463)  13.967%,
  rgba(255, 255, 255, 0.459)  13.967%,
  rgba(255, 255, 255, 0.457)  14.120%,
  rgba(255, 255, 255, 0.455)  14.275%,
  rgba(255, 255, 255, 0.451)  14.275%,
  rgba(255, 255, 255, 0.449)  14.431%,
  rgba(255, 255, 255, 0.447)  14.589%,
  rgba(255, 255, 255, 0.443)  14.589%,
  rgba(255, 255, 255, 0.441)  14.748%,
  rgba(255, 255, 255, 0.439)  14.908%,
  rgba(255, 255, 255, 0.435)  14.908%,
  rgba(255, 255, 255, 0.433)  15.070%,
  rgba(255, 255, 255, 0.431)  15.233%,
  rgba(255, 255, 255, 0.427)  15.233%,
  rgba(255, 255, 255, 0.425)  15.398%,
  rgba(255, 255, 255, 0.423)  15.564%,
  rgba(255, 255, 255, 0.420)  15.564%,
  rgba(255, 255, 255, 0.418)  15.732%,
  rgba(255, 255, 255, 0.416)  15.901%,
  rgba(255, 255, 255, 0.412)  15.901%,
  rgba(255, 255, 255, 0.410)  16.072%,
  rgba(255, 255, 255, 0.408)  16.244%,
  rgba(255, 255, 255, 0.404)  16.244%,
  rgba(255, 255, 255, 0.402)  16.419%,
  rgba(255, 255, 255, 0.400)  16.595%,
  rgba(255, 255, 255, 0.396)  16.595%,
  rgba(255, 255, 255, 0.394)  16.772%,
  rgba(255, 255, 255, 0.392)  16.952%,
  rgba(255, 255, 255, 0.388)  16.952%,
  rgba(255, 255, 255, 0.386)  17.133%,
  rgba(255, 255, 255, 0.384)  17.316%,
  rgba(255, 255, 255, 0.380)  17.316%,
  rgba(255, 255, 255, 0.378)  17.501%,
  rgba(255, 255, 255, 0.377)  17.688%,
  rgba(255, 255, 255, 0.372)  17.688%,
  rgba(255, 255, 255, 0.371)  17.877%,
  rgba(255, 255, 255, 0.369)  18.068%,
  rgba(255, 255, 255, 0.365)  18.068%,
  rgba(255, 255, 255, 0.363)  18.261%,
  rgba(255, 255, 255, 0.361)  18.456%,
  rgba(255, 255, 255, 0.357)  18.456%,
  rgba(255, 255, 255, 0.355)  18.653%,
  rgba(255, 255, 255, 0.353)  18.852%,
  rgba(255, 255, 255, 0.349)  18.852%,
  rgba(255, 255, 255, 0.347)  19.053%,
  rgba(255, 255, 255, 0.345)  19.257%,
  rgba(255, 255, 255, 0.341)  19.257%,
  rgba(255, 255, 255, 0.339)  19.463%,
  rgba(255, 255, 255, 0.337)  19.672%,
  rgba(255, 255, 255, 0.333)  19.672%,
  rgba(255, 255, 255, 0.331)  19.883%,
  rgba(255, 255, 255, 0.329)  20.096%,
  rgba(255, 255, 255, 0.326)  20.096%,
  rgba(255, 255, 255, 0.324)  20.312%,
  rgba(255, 255, 255, 0.322)  20.531%,
  rgba(255, 255, 255, 0.318)  20.531%,
  rgba(255, 255, 255, 0.316)  20.752%,
  rgba(255, 255, 255, 0.314)  20.976%,
  rgba(255, 255, 255, 0.310)  20.976%,
  rgba(255, 255, 255, 0.308)  21.203%,
  rgba(255, 255, 255, 0.306)  21.433%,
  rgba(255, 255, 255, 0.302)  21.433%,
  rgba(255, 255, 255, 0.300)  21.665%,
  rgba(255, 255, 255, 0.298)  21.901%,
  rgba(255, 255, 255, 0.294)  21.901%,
  rgba(255, 255, 255, 0.292)  22.140%,
  rgba(255, 255, 255, 0.290)  22.382%,
  rgba(255, 255, 255, 0.286)  22.382%,
  rgba(255, 255, 255, 0.284)  22.627%,
  rgba(255, 255, 255, 0.282)  22.876%,
  rgba(255, 255, 255, 0.278)  22.876%,
  rgba(255, 255, 255, 0.277)  23.128%,
  rgba(255, 255, 255, 0.275)  23.384%,
  rgba(255, 255, 255, 0.271)  23.384%,
  rgba(255, 255, 255, 0.269)  23.643%,
  rgba(255, 255, 255, 0.267)  23.907%,
  rgba(255, 255, 255, 0.263)  23.907%,
  rgba(255, 255, 255, 0.261)  24.174%,
  rgba(255, 255, 255, 0.259)  24.445%,
  rgba(255, 255, 255, 0.255)  24.445%,
  rgba(255, 255, 255, 0.253)  24.720%,
  rgba(255, 255, 255, 0.251)  25.000%,
  rgba(255, 255, 255, 0.247)  25.000%,
  rgba(255, 255, 255, 0.245)  25.284%,
  rgba(255, 255, 255, 0.243)  25.573%,
  rgba(255, 255, 255, 0.239)  25.573%,
  rgba(255, 255, 255, 0.237)  25.866%,
  rgba(255, 255, 255, 0.235)  26.164%,
  rgba(255, 255, 255, 0.231)  26.164%,
  rgba(255, 255, 255, 0.229)  26.467%,
  rgba(255, 255, 255, 0.228)  26.775%,
  rgba(255, 255, 255, 0.224)  26.775%,
  rgba(255, 255, 255, 0.222)  27.089%,
  rgba(255, 255, 255, 0.220)  27.408%,
  rgba(255, 255, 255, 0.216)  27.408%,
  rgba(255, 255, 255, 0.214)  27.733%,
  rgba(255, 255, 255, 0.212)  28.064%,
  rgba(255, 255, 255, 0.208)  28.064%,
  rgba(255, 255, 255, 0.206)  28.401%,
  rgba(255, 255, 255, 0.204)  28.744%,
  rgba(255, 255, 255, 0.200)  28.744%,
  rgba(255, 255, 255, 0.198)  29.095%,
  rgba(255, 255, 255, 0.196)  29.452%,
  rgba(255, 255, 255, 0.192)  29.452%,
  rgba(255, 255, 255, 0.190)  29.816%,
  rgba(255, 255, 255, 0.188)  30.188%,
  rgba(255, 255, 255, 0.184)  30.188%,
  rgba(255, 255, 255, 0.182)  30.568%,
  rgba(255, 255, 255, 0.180)  30.956%,
  rgba(255, 255, 255, 0.176)  30.956%,
  rgba(255, 255, 255, 0.174)  31.352%,
  rgba(255, 255, 255, 0.172)  31.757%,
  rgba(255, 255, 255, 0.169)  31.757%,
  rgba(255, 255, 255, 0.167)  32.172%,
  rgba(255, 255, 255, 0.165)  32.596%,
  rgba(255, 255, 255, 0.161)  32.596%,
  rgba(255, 255, 255, 0.159)  33.031%,
  rgba(255, 255, 255, 0.157)  33.476%,
  rgba(255, 255, 255, 0.153)  33.476%,
  rgba(255, 255, 255, 0.151)  33.932%,
  rgba(255, 255, 255, 0.149)  34.401%,
  rgba(255, 255, 255, 0.145)  34.401%,
  rgba(255, 255, 255, 0.143)  34.882%,
  rgba(255, 255, 255, 0.141)  35.376%,
  rgba(255, 255, 255, 0.137)  35.376%,
  rgba(255, 255, 255, 0.135)  35.884%,
  rgba(255, 255, 255, 0.133)  36.407%,
  rgba(255, 255, 255, 0.129)  36.407%,
  rgba(255, 255, 255, 0.128)  36.945%,
  rgba(255, 255, 255, 0.126)  37.500%,
  rgba(255, 255, 255, 0.122)  37.500%,
  rgba(255, 255, 255, 0.120)  38.072%,
  rgba(255, 255, 255, 0.118)  38.664%,
  rgba(255, 255, 255, 0.114)  38.664%,
  rgba(255, 255, 255, 0.112)  39.275%,
  rgba(255, 255, 255, 0.110)  39.908%,
  rgba(255, 255, 255, 0.106)  39.908%,
  rgba(255, 255, 255, 0.104)  40.564%,
  rgba(255, 255, 255, 0.102)  41.245%,
  rgba(255, 255, 255, 0.098)  41.245%,
  rgba(255, 255, 255, 0.096)  41.952%,
  rgba(255, 255, 255, 0.094)  42.688%,
  rgba(255, 255, 255, 0.090)  42.688%,
  rgba(255, 255, 255, 0.088)  43.456%,
  rgba(255, 255, 255, 0.086)  44.257%,
  rgba(255, 255, 255, 0.082)  44.257%,
  rgba(255, 255, 255, 0.080)  45.096%,
  rgba(255, 255, 255, 0.078)  45.976%,
  rgba(255, 255, 255, 0.074)  45.976%,
  rgba(255, 255, 255, 0.072)  46.901%,
  rgba(255, 255, 255, 0.071)  47.876%,
  rgba(255, 255, 255, 0.067)  47.876%,
  rgba(255, 255, 255, 0.065)  48.907%,
  rgba(255, 255, 255, 0.063)  50.000%,
  rgba(255, 255, 255, 0.059)  50.000%,
  rgba(255, 255, 255, 0.057)  51.164%,
  rgba(255, 255, 255, 0.055)  52.408%,
  rgba(255, 255, 255, 0.051)  52.408%,
  rgba(255, 255, 255, 0.049)  53.745%,
  rgba(255, 255, 255, 0.047)  55.188%,
  rgba(255, 255, 255, 0.043)  55.188%,
  rgba(255, 255, 255, 0.041)  56.757%,
  rgba(255, 255, 255, 0.039)  58.476%,
  rgba(255, 255, 255, 0.035)  58.476%,
  rgba(255, 255, 255, 0.033)  60.376%,
  rgba(255, 255, 255, 0.031)  62.500%,
  rgba(255, 255, 255, 0.028)  62.500%,
  rgba(255, 255, 255, 0.025)  64.908%,
  rgba(255, 255, 255, 0.024)  67.688%,
  rgba(255, 255, 255, 0.020)  67.688%,
  rgba(255, 255, 255, 0.018)  70.976%,
  rgba(255, 255, 255, 0.016)  75.000%,
  rgba(255, 255, 255, 0.012)  75.000%,
  rgba(255, 255, 255, 0.010)  80.188%,
  rgba(255, 255, 255, 0.008)  87.500%,
  rgba(255, 255, 255, 0.004)  87.500%,
  rgba(255, 255, 255, 0.004) 100.000%,
  rgba(255, 255, 255, 0.004) 100.000%
);