A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.674884790664288  8.389906174154394  116000.0  -0.8708467309753483  # for region 1
  8.280789962005153  8.145969902640887  114000.0  3.3936651583710398  # for region 2
  7.785858428286336  7.617333354081005  117875.0  3.164556962025321  # for region 3
  7.550191051198586  7.374099638832595  125125.0  -6.499133448873482  # for region 4
