A 1.0 #regions in PPM
# low field   high field  bias        slope
  258.2279022195372  244.60939216333446  -0.0  -0.0  # for region 1
  187.920353  164.515585  0.0  0.0  # for region 2
  115.868632  42.56818  0.0  0.0  # for region 3
  37.412709  6.319332  0.0  0.0  # for region 4
