A 1.0 #regions in PPM
# low field   high field  bias        slope
  2.0502742197196033  1.8697469299329714  -0.0  -0.0  # for region 1
  1.5731663824263622  0.8510572232798352  -0.0  -0.0  # for region 2
  0.6963195463198653  0.554476675773226  -0.0  -0.0  # for region 3