A 1.0 #regions in PPM
# low field   high field  bias        slope
  8.567779965802236  7.433809087975471  256812.5  4.244139046079227  # for region 1
  7.811327023658245  7.513752660852216  270250.0  3.7179487179487185  # for region 2
  2.547534575265848  2.1845438974429943  291687.5  6.997053872053874  # for region 3
