A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.792493655204233  7.2261219359036755  -0.0  -0.0  # for region 1
  4.018309698141031  3.8376566497434386  -0.0  -0.0  # for region 2
  1.6600550393292228  1.4501069020022916  -0.0  -0.0  # for region 3