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We correct the fitting formula used in refs.
J. R. Ellis, N. E. Mavromatos, D. V. Nanopoulos and A. S. Sakharov, Astron. Astrophys. 402
2003
Earlier work this paper cites.
J. R. Ellis, N. E. Mavromatos, D. V. Nanopoulos, A. S. Sakharov and E. K. G. Sarkisyan, Astropart. Phys. 25
2006
Cited alongside, same era.
U. Jacob and T. Piran, arXiv:0712.2170 [astro-ph]
Cited in the paper.
M. Rodriguez Martinez and T. Piran, JCAP 0604
2006
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