Magnitude versus magnitude error for each unique facility and filter combination, with EDF-N shown in colour and EDF-F shown in grey. Each solid line represents the median magnitude uncertainty as a function of magnitude for a given band. The shaded regions are bounded by the 84th and 16th percentiles of the magnitude error distributions, enclosing 68% of the objects. The 5σ limiting magnitudes measured with 2″ diameter apertures reported in Table 3 are shown by vertical lines. A horizontal dotted line indicates a 5σ model-based photometric uncertainty.