A 1.0 #regions in PPM
# low field   high field  bias        slope
  1.687439642620544  1.4771210784678386  -0.0  -0.0  # for region 1
  1.3450605846975352  0.9880081385778258  -0.0  -0.0  # for region 2
  0.7092137628405185  0.5429153632779141  -0.0  -0.0  # for region 3
