P    #regions in PPM
# 2023-08-20 16:33:14 -0400  chris@Chriss-MBP.fios-router.home
# low field   high field   mi   maxi
  7.155906843303795  6.536645674171735  1.778  3.618  # for region 1
  5.931145864353722  5.06418022756884  0.312  1.950  # for region 2
  4.733907604031741  3.9082260451889956  0.546  2.932  # for region 3
  3.53666934370976  3.1513512829164787  75.167  107.281  # for region 4
  2.7109877848670143  2.353192442701825  5.972  8.791  # for region 5
  2.2706242868175504  1.9678743819085436  11.759  13.910  # for region 6
  1.9541130225944978  1.3898972907186216  1.794  3.478  # for region 7
