!energy   fraction   uncertainty
  686.2    0.0558    0.0024
 1328.4    0.0241    0.0012
 1970.6    0.0149    0.0008
 2612.9    0.0128    0.0008
 3255.1    0.0076    0.0007
 3897.4    0.0060    0.0009
 4539.6    0.0041    0.0017