A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.036331034438627  7.973669583877701  -0.0  -0.0  # for region 1
  7.799392424505129  7.736730973944204  -0.0  -0.0  # for region 2
  7.701483908003683  7.4586707870800995  -0.0  -0.0  # for region 3