A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.979704080027091  7.8319317822488115  -0.0  -0.0  # for region 1
  2.80767365778731  2.6733352052616013  -0.0  -0.0  # for region 2
  2.0553783236433416  1.8941721806124912  -0.0  -0.0  # for region 3