new_contents: """
  Migrated from :mod:`mirnylib.plotting`.
  
  """
  from matplotlib.cm import register_cmap
  import matplotlib as mpl
  import numpy as np
  
  
  PALETTES = {
      'fall': np.array((
          (255, 255, 255),
          (255, 255, 204),
          (255, 237, 160),
          (254, 217, 118),
          (254, 178, 76),
          (253, 141, 60),
          (252, 78, 42),
          (227, 26, 28),
          (189, 0, 38),
          (128, 0, 38),
          (0, 0, 0)
      ))/255,
      'blues': np.array((
          (255, 255, 255),
          (180, 204, 225),
          (116, 169, 207),
          (54, 144, 192),
          (5, 112, 176),
          (4, 87, 135),
          (3, 65, 100),
          (2, 40, 66),
          (1, 20, 30),
          (0, 0, 0)
      ))/255,
      'acidblues': np.array((
          (255, 255, 255),
          (162, 192, 222),
          (140, 137, 187),
          (140, 87, 167),
          (140, 45, 143),
          (120, 20, 120),
          (90, 15, 90),
          (60, 10, 60),
          (30, 5, 30),
          (0, 0, 0)
      ))/255,
      'nmeth': np.array((
          (236, 250, 255),
          (148, 189, 217),
          (118, 169, 68),
          (131, 111, 43),
          (122, 47, 25),
          (41, 0, 20)
      ))/255,
  }
  
  
  def list_to_colormap(color_list, name=None):
      color_list = np.array(color_list)
      if color_list.min() < 0:
          raise ValueError("Colors should be 0 to 1, or 0 to 255")
      if color_list.max() > 1.:
          if color_list.max() > 255:
              raise ValueError("Colors should be 0 to 1 or 0 to 255")
          else:
              color_list = color_list / 255.
      return mpl.colors.LinearSegmentedColormap.from_list(name, color_list, 256)
  
  
  def get_cmap(name):
      is_reversed = name.endswith('_r')
      try:
          if is_reversed:
              pal = PALETTES[name[:-2]][::-1]
          else:
              pal = PALETTES[name]
      except KeyError:
          raise ValueError('Palette not found "{}"'.format(name))
      return list_to_colormap(pal)
  
  
  def _register_cmaps():
      for name, pal in PALETTES.items():
          register_cmap(name, list_to_colormap(pal))
          register_cmap(name + "_r", list_to_colormap(pal[::-1]))
  
  
  _register_cmaps()
  
subject: Migrate colormaps from mirnylib