A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.6999008480681645  7.614625073203565  289125.0  -30.80357142857118  # for region 1
  3.472304982218762  3.237824617040196  297750.0  -1.4629388816644993  # for region 2
  2.1214352086073536  1.9740330347122923  289625.0  2.070393374741201  # for region 3
  -3.4467040387704984  -3.578039679744192  205750.0  6.960556844547563  # for region 4
