P    #regions in PPM
# 2016-12-01 12:59:17 -0600  bmrbmb@tonga.nmrfam.wisc.edu
# low field   high field   mi   maxi
  1000.0  5.5381702144688285  0.000  1000000.000  # for region 1
  5.5381702144688285  0.6120188102663278  0.273  17.182  # for region 2
  0.6120188102663278  0.1  0.000  1000000.000  # for region 3
