/*
  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
*/
linear-gradient(
  0deg,
  rgb(255, 255, 255)   0.000%,
  rgba(255, 255, 255, 0.998)   2.657%,
  rgba(255, 255, 255, 0.996)   3.761%,
  rgba(255, 255, 255, 0.992)   3.761%,
  rgba(255, 255, 255, 0.990)   4.611%,
  rgba(255, 255, 255, 0.988)   5.329%,
  rgba(255, 255, 255, 0.984)   5.329%,
  rgba(255, 255, 255, 0.982)   5.964%,
  rgba(255, 255, 255, 0.980)   6.540%,
  rgba(255, 255, 255, 0.977)   6.540%,
  rgba(255, 255, 255, 0.975)   7.071%,
  rgba(255, 255, 255, 0.973)   7.567%,
  rgba(255, 255, 255, 0.969)   7.567%,
  rgba(255, 255, 255, 0.967)   8.034%,
  rgba(255, 255, 255, 0.965)   8.477%,
  rgba(255, 255, 255, 0.961)   8.477%,
  rgba(255, 255, 255, 0.959)   8.900%,
  rgba(255, 255, 255, 0.957)   9.305%,
  rgba(255, 255, 255, 0.953)   9.305%,
  rgba(255, 255, 255, 0.951)   9.695%,
  rgba(255, 255, 255, 0.949)  10.071%,
  rgba(255, 255, 255, 0.945)  10.071%,
  rgba(255, 255, 255, 0.943)  10.435%,
  rgba(255, 255, 255, 0.941)  10.788%,
  rgba(255, 255, 255, 0.937)  10.788%,
  rgba(255, 255, 255, 0.935)  11.132%,
  rgba(255, 255, 255, 0.933)  11.466%,
  rgba(255, 255, 255, 0.929)  11.466%,
  rgba(255, 255, 255, 0.927)  11.793%,
  rgba(255, 255, 255, 0.925)  12.112%,
  rgba(255, 255, 255, 0.922)  12.112%,
  rgba(255, 255, 255, 0.920)  12.424%,
  rgba(255, 255, 255, 0.918)  12.730%,
  rgba(255, 255, 255, 0.914)  12.730%,
  rgba(255, 255, 255, 0.912)  13.030%,
  rgba(255, 255, 255, 0.910)  13.324%,
  rgba(255, 255, 255, 0.906)  13.324%,
  rgba(255, 255, 255, 0.904)  13.613%,
  rgba(255, 255, 255, 0.902)  13.897%,
  rgba(255, 255, 255, 0.898)  13.897%,
  rgba(255, 255, 255, 0.896)  14.177%,
  rgba(255, 255, 255, 0.894)  14.453%,
  rgba(255, 255, 255, 0.890)  14.453%,
  rgba(255, 255, 255, 0.888)  14.725%,
  rgba(255, 255, 255, 0.886)  14.992%,
  rgba(255, 255, 255, 0.882)  14.992%,
  rgba(255, 255, 255, 0.880)  15.257%,
  rgba(255, 255, 255, 0.878)  15.518%,
  rgba(255, 255, 255, 0.875)  15.518%,
  rgba(255, 255, 255, 0.873)  15.776%,
  rgba(255, 255, 255, 0.871)  16.031%,
  rgba(255, 255, 255, 0.867)  16.031%,
  rgba(255, 255, 255, 0.865)  16.283%,
  rgba(255, 255, 255, 0.863)  16.532%,
  rgba(255, 255, 255, 0.859)  16.532%,
  rgba(255, 255, 255, 0.857)  16.778%,
  rgba(255, 255, 255, 0.855)  17.023%,
  rgba(255, 255, 255, 0.851)  17.023%,
  rgba(255, 255, 255, 0.849)  17.264%,
  rgba(255, 255, 255, 0.847)  17.504%,
  rgba(255, 255, 255, 0.843)  17.504%,
  rgba(255, 255, 255, 0.841)  17.741%,
  rgba(255, 255, 255, 0.839)  17.977%,
  rgba(255, 255, 255, 0.835)  17.977%,
  rgba(255, 255, 255, 0.833)  18.210%,
  rgba(255, 255, 255, 0.831)  18.442%,
  rgba(255, 255, 255, 0.828)  18.442%,
  rgba(255, 255, 255, 0.826)  18.672%,
  rgba(255, 255, 255, 0.824)  18.900%,
  rgba(255, 255, 255, 0.820)  18.900%,
  rgba(255, 255, 255, 0.818)  19.126%,
  rgba(255, 255, 255, 0.816)  19.351%,
  rgba(255, 255, 255, 0.812)  19.351%,
  rgba(255, 255, 255, 0.810)  19.574%,
  rgba(255, 255, 255, 0.808)  19.796%,
  rgba(255, 255, 255, 0.804)  19.796%,
  rgba(255, 255, 255, 0.802)  20.016%,
  rgba(255, 255, 255, 0.800)  20.235%,
  rgba(255, 255, 255, 0.796)  20.235%,
  rgba(255, 255, 255, 0.794)  20.453%,
  rgba(255, 255, 255, 0.792)  20.670%,
  rgba(255, 255, 255, 0.788)  20.670%,
  rgba(255, 255, 255, 0.786)  20.885%,
  rgba(255, 255, 255, 0.784)  21.099%,
  rgba(255, 255, 255, 0.780)  21.099%,
  rgba(255, 255, 255, 0.778)  21.312%,
  rgba(255, 255, 255, 0.776)  21.524%,
  rgba(255, 255, 255, 0.772)  21.524%,
  rgba(255, 255, 255, 0.771)  21.736%,
  rgba(255, 255, 255, 0.769)  21.946%,
  rgba(255, 255, 255, 0.765)  21.946%,
  rgba(255, 255, 255, 0.763)  22.155%,
  rgba(255, 255, 255, 0.761)  22.363%,
  rgba(255, 255, 255, 0.757)  22.363%,
  rgba(255, 255, 255, 0.755)  22.570%,
  rgba(255, 255, 255, 0.753)  22.777%,
  rgba(255, 255, 255, 0.749)  22.777%,
  rgba(255, 255, 255, 0.747)  22.983%,
  rgba(255, 255, 255, 0.745)  23.188%,
  rgba(255, 255, 255, 0.741)  23.188%,
  rgba(255, 255, 255, 0.739)  23.392%,
  rgba(255, 255, 255, 0.737)  23.596%,
  rgba(255, 255, 255, 0.733)  23.596%,
  rgba(255, 255, 255, 0.731)  23.799%,
  rgba(255, 255, 255, 0.729)  24.001%,
  rgba(255, 255, 255, 0.726)  24.001%,
  rgba(255, 255, 255, 0.724)  24.203%,
  rgba(255, 255, 255, 0.722)  24.404%,
  rgba(255, 255, 255, 0.718)  24.404%,
  rgba(255, 255, 255, 0.716)  24.604%,
  rgba(255, 255, 255, 0.714)  24.804%,
  rgba(255, 255, 255, 0.710)  24.804%,
  rgba(255, 255, 255, 0.708)  25.004%,
  rgba(255, 255, 255, 0.706)  25.203%,
  rgba(255, 255, 255, 0.702)  25.203%,
  rgba(255, 255, 255, 0.700)  25.401%,
  rgba(255, 255, 255, 0.698)  25.599%,
  rgba(255, 255, 255, 0.694)  25.599%,
  rgba(255, 255, 255, 0.692)  25.797%,
  rgba(255, 255, 255, 0.690)  25.994%,
  rgba(255, 255, 255, 0.686)  25.994%,
  rgba(255, 255, 255, 0.684)  26.191%,
  rgba(255, 255, 255, 0.682)  26.388%,
  rgba(255, 255, 255, 0.678)  26.388%,
  rgba(255, 255, 255, 0.676)  26.584%,
  rgba(255, 255, 255, 0.674)  26.780%,
  rgba(255, 255, 255, 0.671)  26.780%,
  rgba(255, 255, 255, 0.669)  26.976%,
  rgba(255, 255, 255, 0.667)  27.171%,
  rgba(255, 255, 255, 0.663)  27.171%,
  rgba(255, 255, 255, 0.661)  27.366%,
  rgba(255, 255, 255, 0.659)  27.561%,
  rgba(255, 255, 255, 0.655)  27.561%,
  rgba(255, 255, 255, 0.653)  27.756%,
  rgba(255, 255, 255, 0.651)  27.950%,
  rgba(255, 255, 255, 0.647)  27.950%,
  rgba(255, 255, 255, 0.645)  28.144%,
  rgba(255, 255, 255, 0.643)  28.338%,
  rgba(255, 255, 255, 0.639)  28.338%,
  rgba(255, 255, 255, 0.637)  28.532%,
  rgba(255, 255, 255, 0.635)  28.726%,
  rgba(255, 255, 255, 0.631)  28.726%,
  rgba(255, 255, 255, 0.629)  28.920%,
  rgba(255, 255, 255, 0.627)  29.113%,
  rgba(255, 255, 255, 0.624)  29.113%,
  rgba(255, 255, 255, 0.622)  29.307%,
  rgba(255, 255, 255, 0.620)  29.500%,
  rgba(255, 255, 255, 0.616)  29.500%,
  rgba(255, 255, 255, 0.614)  29.694%,
  rgba(255, 255, 255, 0.612)  29.887%,
  rgba(255, 255, 255, 0.608)  29.887%,
  rgba(255, 255, 255, 0.606)  30.081%,
  rgba(255, 255, 255, 0.604)  30.274%,
  rgba(255, 255, 255, 0.600)  30.274%,
  rgba(255, 255, 255, 0.598)  30.467%,
  rgba(255, 255, 255, 0.596)  30.661%,
  rgba(255, 255, 255, 0.592)  30.661%,
  rgba(255, 255, 255, 0.590)  30.854%,
  rgba(255, 255, 255, 0.588)  31.048%,
  rgba(255, 255, 255, 0.584)  31.048%,
  rgba(255, 255, 255, 0.582)  31.242%,
  rgba(255, 255, 255, 0.580)  31.435%,
  rgba(255, 255, 255, 0.577)  31.435%,
  rgba(255, 255, 255, 0.575)  31.629%,
  rgba(255, 255, 255, 0.573)  31.823%,
  rgba(255, 255, 255, 0.569)  31.823%,
  rgba(255, 255, 255, 0.567)  32.017%,
  rgba(255, 255, 255, 0.565)  32.212%,
  rgba(255, 255, 255, 0.561)  32.212%,
  rgba(255, 255, 255, 0.559)  32.406%,
  rgba(255, 255, 255, 0.557)  32.601%,
  rgba(255, 255, 255, 0.553)  32.601%,
  rgba(255, 255, 255, 0.551)  32.796%,
  rgba(255, 255, 255, 0.549)  32.991%,
  rgba(255, 255, 255, 0.545)  32.991%,
  rgba(255, 255, 255, 0.543)  33.186%,
  rgba(255, 255, 255, 0.541)  33.382%,
  rgba(255, 255, 255, 0.537)  33.382%,
  rgba(255, 255, 255, 0.535)  33.578%,
  rgba(255, 255, 255, 0.533)  33.774%,
  rgba(255, 255, 255, 0.529)  33.774%,
  rgba(255, 255, 255, 0.527)  33.970%,
  rgba(255, 255, 255, 0.525)  34.167%,
  rgba(255, 255, 255, 0.522)  34.167%,
  rgba(255, 255, 255, 0.520)  34.364%,
  rgba(255, 255, 255, 0.518)  34.562%,
  rgba(255, 255, 255, 0.514)  34.562%,
  rgba(255, 255, 255, 0.512)  34.760%,
  rgba(255, 255, 255, 0.510)  34.958%,
  rgba(255, 255, 255, 0.506)  34.958%,
  rgba(255, 255, 255, 0.504)  35.156%,
  rgba(255, 255, 255, 0.502)  35.355%,
  rgba(255, 255, 255, 0.498)  35.355%,
  rgba(255, 255, 255, 0.496)  35.555%,
  rgba(255, 255, 255, 0.494)  35.755%,
  rgba(255, 255, 255, 0.490)  35.755%,
  rgba(255, 255, 255, 0.488)  35.955%,
  rgba(255, 255, 255, 0.486)  36.156%,
  rgba(255, 255, 255, 0.482)  36.156%,
  rgba(255, 255, 255, 0.480)  36.357%,
  rgba(255, 255, 255, 0.478)  36.559%,
  rgba(255, 255, 255, 0.474)  36.559%,
  rgba(255, 255, 255, 0.472)  36.762%,
  rgba(255, 255, 255, 0.471)  36.965%,
  rgba(255, 255, 255, 0.467)  36.965%,
  rgba(255, 255, 255, 0.465)  37.168%,
  rgba(255, 255, 255, 0.463)  37.372%,
  rgba(255, 255, 255, 0.459)  37.372%,
  rgba(255, 255, 255, 0.457)  37.577%,
  rgba(255, 255, 255, 0.455)  37.783%,
  rgba(255, 255, 255, 0.451)  37.783%,
  rgba(255, 255, 255, 0.449)  37.989%,
  rgba(255, 255, 255, 0.447)  38.195%,
  rgba(255, 255, 255, 0.443)  38.195%,
  rgba(255, 255, 255, 0.441)  38.403%,
  rgba(255, 255, 255, 0.439)  38.611%,
  rgba(255, 255, 255, 0.435)  38.611%,
  rgba(255, 255, 255, 0.433)  38.820%,
  rgba(255, 255, 255, 0.431)  39.029%,
  rgba(255, 255, 255, 0.427)  39.029%,
  rgba(255, 255, 255, 0.425)  39.240%,
  rgba(255, 255, 255, 0.423)  39.451%,
  rgba(255, 255, 255, 0.420)  39.451%,
  rgba(255, 255, 255, 0.418)  39.663%,
  rgba(255, 255, 255, 0.416)  39.876%,
  rgba(255, 255, 255, 0.412)  39.876%,
  rgba(255, 255, 255, 0.410)  40.090%,
  rgba(255, 255, 255, 0.408)  40.304%,
  rgba(255, 255, 255, 0.404)  40.304%,
  rgba(255, 255, 255, 0.402)  40.520%,
  rgba(255, 255, 255, 0.400)  40.737%,
  rgba(255, 255, 255, 0.396)  40.737%,
  rgba(255, 255, 255, 0.394)  40.954%,
  rgba(255, 255, 255, 0.392)  41.173%,
  rgba(255, 255, 255, 0.388)  41.173%,
  rgba(255, 255, 255, 0.386)  41.392%,
  rgba(255, 255, 255, 0.384)  41.613%,
  rgba(255, 255, 255, 0.380)  41.613%,
  rgba(255, 255, 255, 0.378)  41.834%,
  rgba(255, 255, 255, 0.377)  42.057%,
  rgba(255, 255, 255, 0.372)  42.057%,
  rgba(255, 255, 255, 0.371)  42.281%,
  rgba(255, 255, 255, 0.369)  42.506%,
  rgba(255, 255, 255, 0.365)  42.506%,
  rgba(255, 255, 255, 0.363)  42.732%,
  rgba(255, 255, 255, 0.361)  42.960%,
  rgba(255, 255, 255, 0.357)  42.960%,
  rgba(255, 255, 255, 0.355)  43.189%,
  rgba(255, 255, 255, 0.353)  43.419%,
  rgba(255, 255, 255, 0.349)  43.419%,
  rgba(255, 255, 255, 0.347)  43.650%,
  rgba(255, 255, 255, 0.345)  43.883%,
  rgba(255, 255, 255, 0.341)  43.883%,
  rgba(255, 255, 255, 0.339)  44.117%,
  rgba(255, 255, 255, 0.337)  44.353%,
  rgba(255, 255, 255, 0.333)  44.353%,
  rgba(255, 255, 255, 0.331)  44.590%,
  rgba(255, 255, 255, 0.329)  44.829%,
  rgba(255, 255, 255, 0.326)  44.829%,
  rgba(255, 255, 255, 0.324)  45.069%,
  rgba(255, 255, 255, 0.322)  45.311%,
  rgba(255, 255, 255, 0.318)  45.311%,
  rgba(255, 255, 255, 0.316)  45.554%,
  rgba(255, 255, 255, 0.314)  45.800%,
  rgba(255, 255, 255, 0.310)  45.800%,
  rgba(255, 255, 255, 0.308)  46.046%,
  rgba(255, 255, 255, 0.306)  46.295%,
  rgba(255, 255, 255, 0.302)  46.295%,
  rgba(255, 255, 255, 0.300)  46.546%,
  rgba(255, 255, 255, 0.298)  46.798%,
  rgba(255, 255, 255, 0.294)  46.798%,
  rgba(255, 255, 255, 0.292)  47.053%,
  rgba(255, 255, 255, 0.290)  47.309%,
  rgba(255, 255, 255, 0.286)  47.309%,
  rgba(255, 255, 255, 0.284)  47.568%,
  rgba(255, 255, 255, 0.282)  47.829%,
  rgba(255, 255, 255, 0.278)  47.829%,
  rgba(255, 255, 255, 0.277)  48.092%,
  rgba(255, 255, 255, 0.275)  48.357%,
  rgba(255, 255, 255, 0.271)  48.357%,
  rgba(255, 255, 255, 0.269)  48.624%,
  rgba(255, 255, 255, 0.267)  48.895%,
  rgba(255, 255, 255, 0.263)  48.895%,
  rgba(255, 255, 255, 0.261)  49.167%,
  rgba(255, 255, 255, 0.259)  49.442%,
  rgba(255, 255, 255, 0.255)  49.442%,
  rgba(255, 255, 255, 0.253)  49.720%,
  rgba(255, 255, 255, 0.251)  50.000%,
  rgba(255, 255, 255, 0.247)  50.000%,
  rgba(255, 255, 255, 0.245)  50.283%,
  rgba(255, 255, 255, 0.243)  50.569%,
  rgba(255, 255, 255, 0.239)  50.569%,
  rgba(255, 255, 255, 0.237)  50.858%,
  rgba(255, 255, 255, 0.235)  51.151%,
  rgba(255, 255, 255, 0.231)  51.151%,
  rgba(255, 255, 255, 0.229)  51.446%,
  rgba(255, 255, 255, 0.228)  51.745%,
  rgba(255, 255, 255, 0.224)  51.745%,
  rgba(255, 255, 255, 0.222)  52.047%,
  rgba(255, 255, 255, 0.220)  52.353%,
  rgba(255, 255, 255, 0.216)  52.353%,
  rgba(255, 255, 255, 0.214)  52.662%,
  rgba(255, 255, 255, 0.212)  52.975%,
  rgba(255, 255, 255, 0.208)  52.975%,
  rgba(255, 255, 255, 0.206)  53.293%,
  rgba(255, 255, 255, 0.204)  53.614%,
  rgba(255, 255, 255, 0.200)  53.614%,
  rgba(255, 255, 255, 0.198)  53.940%,
  rgba(255, 255, 255, 0.196)  54.270%,
  rgba(255, 255, 255, 0.192)  54.270%,
  rgba(255, 255, 255, 0.190)  54.604%,
  rgba(255, 255, 255, 0.188)  54.944%,
  rgba(255, 255, 255, 0.184)  54.944%,
  rgba(255, 255, 255, 0.182)  55.288%,
  rgba(255, 255, 255, 0.180)  55.638%,
  rgba(255, 255, 255, 0.176)  55.638%,
  rgba(255, 255, 255, 0.174)  55.993%,
  rgba(255, 255, 255, 0.172)  56.353%,
  rgba(255, 255, 255, 0.169)  56.353%,
  rgba(255, 255, 255, 0.167)  56.720%,
  rgba(255, 255, 255, 0.165)  57.093%,
  rgba(255, 255, 255, 0.161)  57.093%,
  rgba(255, 255, 255, 0.159)  57.472%,
  rgba(255, 255, 255, 0.157)  57.858%,
  rgba(255, 255, 255, 0.153)  57.858%,
  rgba(255, 255, 255, 0.151)  58.252%,
  rgba(255, 255, 255, 0.149)  58.652%,
  rgba(255, 255, 255, 0.145)  58.652%,
  rgba(255, 255, 255, 0.143)  59.061%,
  rgba(255, 255, 255, 0.141)  59.478%,
  rgba(255, 255, 255, 0.137)  59.478%,
  rgba(255, 255, 255, 0.135)  59.903%,
  rgba(255, 255, 255, 0.133)  60.338%,
  rgba(255, 255, 255, 0.129)  60.338%,
  rgba(255, 255, 255, 0.128)  60.782%,
  rgba(255, 255, 255, 0.126)  61.237%,
  rgba(255, 255, 255, 0.122)  61.237%,
  rgba(255, 255, 255, 0.120)  61.703%,
  rgba(255, 255, 255, 0.118)  62.180%,
  rgba(255, 255, 255, 0.114)  62.180%,
  rgba(255, 255, 255, 0.112)  62.670%,
  rgba(255, 255, 255, 0.110)  63.173%,
  rgba(255, 255, 255, 0.106)  63.173%,
  rgba(255, 255, 255, 0.104)  63.690%,
  rgba(255, 255, 255, 0.102)  64.222%,
  rgba(255, 255, 255, 0.098)  64.222%,
  rgba(255, 255, 255, 0.096)  64.770%,
  rgba(255, 255, 255, 0.094)  65.336%,
  rgba(255, 255, 255, 0.090)  65.336%,
  rgba(255, 255, 255, 0.088)  65.921%,
  rgba(255, 255, 255, 0.086)  66.526%,
  rgba(255, 255, 255, 0.082)  66.526%,
  rgba(255, 255, 255, 0.080)  67.154%,
  rgba(255, 255, 255, 0.078)  67.805%,
  rgba(255, 255, 255, 0.074)  67.805%,
  rgba(255, 255, 255, 0.072)  68.484%,
  rgba(255, 255, 255, 0.071)  69.192%,
  rgba(255, 255, 255, 0.067)  69.192%,
  rgba(255, 255, 255, 0.065)  69.933%,
  rgba(255, 255, 255, 0.063)  70.711%,
  rgba(255, 255, 255, 0.059)  70.711%,
  rgba(255, 255, 255, 0.057)  71.529%,
  rgba(255, 255, 255, 0.055)  72.393%,
  rgba(255, 255, 255, 0.051)  72.393%,
  rgba(255, 255, 255, 0.049)  73.311%,
  rgba(255, 255, 255, 0.047)  74.289%,
  rgba(255, 255, 255, 0.043)  74.289%,
  rgba(255, 255, 255, 0.041)  75.337%,
  rgba(255, 255, 255, 0.039)  76.469%,
  rgba(255, 255, 255, 0.035)  76.469%,
  rgba(255, 255, 255, 0.033)  77.702%,
  rgba(255, 255, 255, 0.031)  79.057%,
  rgba(255, 255, 255, 0.028)  79.057%,
  rgba(255, 255, 255, 0.025)  80.566%,
  rgba(255, 255, 255, 0.024)  82.273%,
  rgba(255, 255, 255, 0.020)  82.273%,
  rgba(255, 255, 255, 0.018)  84.247%,
  rgba(255, 255, 255, 0.016)  86.603%,
  rgba(255, 255, 255, 0.012)  86.603%,
  rgba(255, 255, 255, 0.010)  89.548%,
  rgba(255, 255, 255, 0.008)  93.541%,
  rgba(255, 255, 255, 0.004)  93.541%,
  rgba(255, 255, 255, 0.004) 100.000%,
  rgba(255, 255, 255, 0.004) 100.000%
);