Completeness curves for different distances from the cluster centre, based on V-band photometry. These curves correspond to a ten-order smoothed spline fitted to the data. Different lines are the completeness curves for different annuli, with the respective data points: 0 ≤ r < 10″ (red dotted/circle); 10 ≤ r < 20″ (green dashed/triangle); 20 ≤ r < 30″ (black solid/rhombus); 30 ≤ r < 40″ (blue dash dotted/inverted triangle); 40 ≤ r < 50″ (cyan long dashed/square). The magnitude limit corresponding to 50% of completeness are indicated in the plots. Completeness uncertainties are indicated in grey vertically (assumed as Poissonian), and typical magnitude uncertainties are indicated in grey horizontally.