P    #regions in PPM
# 2020-03-17 18:32:34 +0100  Admin@HFD-002
# low field   high field   mi   maxi
  164.64499022676688  162.91235271493636  0.147  0.296  # for region 1
  154.3824449643861  151.405862572267  0.212  0.446  # for region 2
  143.76448687906574  139.9437990324651  0.661  0.957  # for region 3
  126.30483195215818  121.41790563673877  0.320  0.616  # for region 4
