A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.734880119455733  8.582019717365258  392000.0  -294.82071713147405  # for region 1
  7.715810772185898  7.592066637160275  460000.0  926.1083743842355  # for region 2
  7.555671303329209  7.402810901238734  1268000.0  -1561.7529880478123  # for region 3
