A 1.0 #regions in PPM
# low field   high field  bias        slope
  3.1954561857892694  2.997507572510288  -0.0  -0.0  # for region 1
  2.5846433219569844  2.3753833593477753  -0.0  -0.0  # for region 2
  2.2339914927199316  2.1265336740827703  -0.0  -0.0  # for region 3