MERGED (2b reconcile): duplicate of D-9 - HiRes — High Resolution Fly’s Eye (UHECR air-fluorescence detector) (same HiRes detector). Survivor = D-9 (lowest id). Source S-63 repointed to D-9. Retained per move-never-delete.
known_biases: fluorescence-based absolute energy scale (~17%) tied to atmospheric/detector calibration and monocular shower reconstruction; all HiRes flux points share this energy-scale systematic, distinct from Auger’s.