O-11 - TA spectrum agrees with HiRes, and with Auger up to a 20 percent energy-scale shift except a 3-sigma difference in break energy
The comparison rests on the TA dataset together with the published AGASA, HiRes, and Auger spectra shown in Fig. 5. Its significance: three geographically and technique-independent experiments (HiRes fluorescence, TA surface array in the Northern hemisphere, Auger hybrid in the Southern hemisphere) all see a high-energy suppression, so the feature is physical rather than an instrumental artifact of any single detector; the residual 3-sigma discrepancy concerns the break’s exact energy, not its existence.
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Why this is evidence
Three technique- and hemisphere-independent experiments seeing the same structure is very likely under any physical account (H-9, H-12, H-21) and unlikely under the shared-instrumental-artifact branch of H-37. The residual 3-sigma break-energy difference cuts the other way for a common energy-scale artifact, and mildly favors accounts (H-12-style source astrophysics) that allow the northern and southern skies to differ.