A 1.0 #regions in PPM
# low field   high field  bias        slope
  9.337766  8.68462  0.0  0.0  # for region 1
  8.21023  7.522478  0.0  0.0  # for region 2
  6.599823  5.27405  0.0  0.0  # for region 3
  3.329279  1.587326  0.0  0.0  # for region 4
