E[MeV]   deltaE/E[68% containment half width]
10.0  0.700967460105
17.7402629852  0.400927238991
31.4716930389  0.276697934752
55.8316116333  0.227986998008
99.0467529297  0.196611484094
175.711532593  0.16598511808
311.716888428  0.140163937243
552.99395752  0.117784631732
981.025878906  0.100976257548
1740.36572266  0.0888580488192
3087.45458984  0.0778048777078
5477.22558594  0.0682766684841
9716.7421875  0.0632673773133
17237.7558594  0.062184419579
30580.234375  0.0630786801038
54250.140625  0.0666649070925
96241.171875  0.0727496049536
170734.375  0.0804665341422
302887.28125  0.0888698056022
537330.0  0.0988887978791
953237.5625  0.123330158236
1691068.5  0.180376259978
3000000.0  0.240718871092