A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.824335220464248  7.684133486672332  -0.0  -0.0  # for region 1
  7.516969880997355  7.3120596546860925  -0.0  -0.0  # for region 2
  2.6422634445399598  2.5667702032673896  -0.0  -0.0  # for region 3