A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.807193854049165  7.653553741761026  -0.0  -0.0  # for region 1
  7.460081007768554  7.277989022834463  -0.0  -0.0  # for region 2
  2.600501159839992  2.5435974145480884  -0.0  -0.0  # for region 3