A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.4052723235511015  -8.579901726597138  -0.0  -0.0  # for region 1
  7.303130636329707  -7.2009889491083126  -0.0  -0.0  # for region 2
  5.464580266344606  -6.741351356612037  -0.0  -0.0  # for region 3
