A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.396798811112175  7.071970554247811  131906.25  1.2324146678966783  # for region 1
  7.591651930268634  7.398208901364233  148593.75  -3.3517350157728716  # for region 2
  0.005860220522424981  -0.6358339266831105  125250.0  -1.9782246549262243  # for region 3
  -0.9021730434038188  -1.301869961367536  117843.75  -2.33957219251337  # for region 4
