A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.12799861409066  7.94052245558113  -0.0  -0.0  # for region 1
  1.7900949328652052  1.717523516667967  -0.0  -0.0  # for region 2
  1.5421425941913085  1.439333087911888  -0.0  -0.0  # for region 3