A 1.0 #regions in PPM
# low field   high field  bias        slope
  13.36322869955157  11.497757847533633  -0.0  -0.0  # for region 1
  3.2609529206238466  3.1515346327795144  -0.0  -0.0  # for region 2
  2.7325777674808216  2.5914857647341827  -0.0  -0.0  # for region 3