A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.453670318026714  7.3179150796060295  -0.0  -0.0  # for region 1
  3.910291857620044  3.8090117757222273  -0.0  -0.0  # for region 2
  3.7482437265835373  3.6918791592664917  -0.0  -0.0  # for region 3
  3.674265231979915  3.5615360973458237  -0.0  -0.0  # for region 4