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Table 2.

Characteristics of the four generic source models: A, B, C and D (see text), giving the spectral index, the relative normalization of the rigidity spectrum for different nuclear components, and the maximum rigidity (common to all species).

Model β α(H) α(He) α(C) α(O) α(Si) α(Fe) Rmax (EV) Evolution
A −0.45 20.% 49.% 10.% 16.% 2.7% 1.3% 1.6% Yes
B +0.85 7.7% 13.% 34.% 38.% 4.6% 2.5% 4.5% No
C −0.60 17.% 47.% 12.% 19.% 2.8% 1.9% 1.4% Yes

D Adapted and modified from Globus et al. (2015a) Yes

Notes. The last column indicates whether the model assumes a cosmological evolution of the source luminosity (as function of redshift/time). When it is the case, the evolution is assumed to be similar to that of GRBs, as estimated in Wanderman & Piran (2010).

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