A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.29850413663753  7.199948084887837  -0.0  -0.0  # for region 1
  2.960968431472999  2.8002827506242665  -0.0  -0.0  # for region 2
  2.8002827506242665  2.6496399248285796  -0.0  -0.0  # for region 3
  2.5006709082084004  2.2998138071474847  -0.0  -0.0  # for region 4
