Fig. 3.

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Regions of star cluster parameter space where aperture photometry meets the required accuracy. The grey areas and regions with blue or red squares indicate the cluster mass and age combinations containing at least 50% (out of ∼1300) of clusters satisfying the photometric error threshold, σt. Top row: results for the F475W passband. Middle row: results for F336W−F475W. Bottom row: results for F475W−F814W. Left column: results for different background fields, using Rap = 1.5×R50 and the error threshold σt≤0.05 mag. Middle column: results depending on the σt threshold value for the B3 field, using Rap = 1.5×R50. Right column: results depending on the aperture size for the B3 field and the error threshold σt≤0.05 mag. Results are based on artificial clusters with half-light radii of R50 = 0.25″−1.00″.
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