P     #regions in PPM
# low field   high field
  5.712686257215604  5.661444439741259  # for region 1
  5.543432981315495  5.489085599145735  # for region 2
  1.5652046064890812  1.5217267007532735  # for region 3
  1.093158772786025  1.0481280847025098  # for region 4
