A 1.0 #regions in PPM
# low field   high field  bias        slope
  7.713816908916109  7.6124978642581285  65187.5  -8.915165165165165  # for region 1
  2.870907997670841  2.678336322750151  66687.5  7.514768010355574  # for region 2
  0.7382739561935135  0.5331369133878864  60875.0  0.6126303280321151  # for region 3
  -0.6701827188459842  -0.7446474653844269  50500.0  2.054222589936878  # for region 4
