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.