E[MeV]   deltaE/E[68% containment half width]
10.0  0.659273860872
17.7402629852  0.400599606819
31.4716930389  0.290968401786
55.8316116333  0.248229228536
99.0467529297  0.21561709921
175.711532593  0.179023217222
311.716888428  0.148853724845
552.99395752  0.121496029371
981.025878906  0.101009845192
1740.36572266  0.0892239706761
3087.45458984  0.079606556977
5477.22558594  0.0717236848257
9716.7421875  0.0685071862508
17237.7558594  0.0689165431623
30580.234375  0.0720338381089
54250.140625  0.0775956094796
96241.171875  0.0847080835048
170734.375  0.0925092309219
302887.28125  0.0991303565716
537330.0  0.104643284007
953237.5625  0.12557122658
1691068.5  0.182073451055
3000000.0  0.238461782026