Most-likely value (symbols), 68% and 95% CIs for p (filled symbols) and He (open symbols) for the four propagation configurations gathered in Table 2. Top panel: spectral index α. Bottom panel: low-energy source parameter ηS (see Eq. (6)). The grey line ηS = −1 corresponds to the value for which the source spectrum is a pure power-law in rigidity (i.e. dQ/dℛ ∝ ℛ−α).
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