E[MeV]   deltaE/E[68% containment half width]
10.0  0.688348436672
17.7402629852  0.392730125542
31.4716930389  0.273174970394
55.8316116333  0.222399476616
99.0467529297  0.188040292386
175.711532593  0.152904827121
311.716888428  0.121729771848
552.99395752  0.0943453570135
981.025878906  0.0766407968286
1740.36572266  0.0665074080608
3087.45458984  0.0578582123847
5477.22558594  0.0504905196262
9716.7421875  0.0460664859409
17237.7558594  0.043964453101
30580.234375  0.0444786155074
54250.140625  0.0477447148248
96241.171875  0.0525502229682
170734.375  0.0577532394773
302887.28125  0.062108783107
537330.0  0.0659602669999
953237.5625  0.0844147357849
1691068.5  0.132235822173
3000000.0  0.17918606412