A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.985004  7.643601  0.0  0.0  # for region 1
  7.427593  7.291700844341207  0.0  0.0  # for region 2
  7.165462694399468  7.023010470153285  0.0  0.0  # for region 3
