A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.8663747208516295  7.823882487383154  -0.0  -0.0  # for region 1
  2.5495340081085636  2.448614953620933  -0.0  -0.0  # for region 2
  2.2892690781141476  2.1724154360758385  -0.0  -0.0  # for region 3