A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.7763662847759383  3.691219695783428  -0.0  -0.0  # for region 1
  2.851260101668122  2.7822223268093293  -0.0  -0.0  # for region 2
  2.7730172901614907  2.6855694420070204  -0.0  -0.0  # for region 3
