A 1.0 #regions in PPM
# low field   high field  bias        slope
  5.167340165848303  4.944649164857479  -0.0  -0.0  # for region 1
  2.081479152118314  1.8633328654334251  -0.0  -0.0  # for region 2
  1.6997231504197585  1.4497638635933234  -0.0  -0.0  # for region 3
