A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.345878776080733  7.19253789738165  132093.75  2.193708609271522  # for region 1
  7.54372801900199  7.383544691675425  156125.0  -24.523809523809472  # for region 2
  -0.1496040170617065  -0.4155667140602959  124250.0  -0.574052812858783  # for region 3
