A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.778465346534654  7.648514851485149  -0.0  -0.0  # for region 1
  7.4628712871287135  7.283415841584159  -0.0  -0.0  # for region 2
  2.6423267326732676  2.4752475247524752  -0.0  -0.0  # for region 3