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Determine whether the residual difference is instrumental (energy-scale nonlinearity, aperture, atmospheric corrections) or a real dependence on sky direction that would imply a nearby source in the northern sky. Answer: yes or no for a direction-dependent flux, with significance after systematics, evaluated in the declination band seen by both.","problem_ref":"252e6dce094a7ab61b329ebdb5d9b7d8d93f569c693df106e5d76e044bf14efb","references":"","settled_by":"Measurements in the common declination band with identical detector types at both sites, such as Auger-type surface stations operated at the Telescope Array site.","status_note":"","title":"Why do Auger and Telescope Array spectra differ above $3 \\times 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