{
  "type": "GradientColormap",
  "log": true,
  "data": [
      [0.001, [  0,   0, 127, 255]],
      [0.110, [  0,   0, 255, 255]],
      [0.125, [  0,   0, 255, 255]],
      [0.340, [  0, 219, 255, 255]],
      [0.350, [  0, 229, 246, 255]],
      [0.375, [ 20, 255, 226, 255]],
      [0.640, [238, 255,   8, 255]],
      [0.650, [246, 245,   0, 255]],
      [0.660, [255, 236,   0, 255]],
      [0.890, [255,  18,   0, 255]],
      [0.910, [231,   0,   0, 255]],
      [1.000, [127,   0,   0, 255]]
  ]
}

Add logarithmic jet for sg.
Add logarithmic jet for sg.
