/*
  cpt-city: ncl/spread_15lev (cpt)

  Colour-tables from NCL (NCAR Command Language), an open-source
  interpreted language designed specifically for scientific data
  analysis and visualisation

  author: University Corporation for Atmospheric Research (UCAR)
  copyright: Custom open-source
  year: 2011
  url: https://phillips.shef.ac.uk/pub/cpt-city/ncl
*/
linear-gradient(
  0deg,
  rgb(255, 255, 255)   0.000%,
  rgb(255, 255, 255)   6.250%,
  rgb(255, 225, 225)   6.250%,
  rgb(255, 225, 225)  12.500%,
  rgb(255, 210, 210)  12.500%,
  rgb(255, 210, 210)  18.750%,
  rgb(255, 165, 165)  18.750%,
  rgb(255, 165, 165)  25.000%,
  rgb(255, 120, 120)  25.000%,
  rgb(255, 120, 120)  31.250%,
  rgb(255,  75,  75)  31.250%,
  rgb(255,  75,  75)  37.500%,
  rgb(255,   0,   0)  37.500%,
  rgb(255,   0,   0)  43.750%,
  rgb(255, 100,   0)  43.750%,
  rgb(255, 100,   0)  50.000%,
  rgb(255, 150,   0)  50.000%,
  rgb(255, 150,   0)  56.250%,
  rgb(255, 200,   0)  56.250%,
  rgb(255, 200,   0)  62.500%,
  rgb(255, 255,   0)  62.500%,
  rgb(255, 255,   0)  68.750%,
  rgb(140, 255,   0)  68.750%,
  rgb(140, 255,   0)  75.000%,
  rgb(  0, 255,   0)  75.000%,
  rgb(  0, 255,   0)  81.250%,
  rgb(  0, 205,  95)  81.250%,
  rgb(  0, 205,  95)  87.500%,
  rgb(  0, 145, 200)  87.500%,
  rgb(  0, 145, 200)  93.750%,
  rgb(  0,   0, 255)  93.750%,
  rgb(  0,   0, 255) 100.000%
);