A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.505612350659603  7.363390333799189  -0.0  -0.0  # for region 1
  3.137250735660081  2.986112016699114  -0.0  -0.0  # for region 2
  2.0934957210534013  2.0119406697328794  -0.0  -0.0  # for region 3
