A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.721297508667923  7.475316648510575  137125.0  1.2810559006211186  # for region 1
  0.2918735029678102  -0.2728382745133878  126437.5  -0.6933170995670993  # for region 2
  0.26726882360728815  -0.8727145260646143  126250.0  -2.7640042883945357  # for region 3
