A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.998819806645793  7.903634835618822  563750.0  -260.3833865814697  # for region 1
  7.483508066948055  7.3948875766815645  473046.875  1240.5498281786959  # for region 2
  4.979158656824659  4.854433522375524  647750.0  -146.34146341463403  # for region 3
