A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.680756633260417  7.5939155859196745  139562.5  -2.4122807017543852  # for region 1
  7.5097465708048015  7.345416588913858  136875.0  -0.34786641929499074  # for region 2
  2.0813143577533273  1.9973992961144662  153000.0  -5.227272727272727  # for region 3
