Covariance index ci (defined for each source as the ratio between the maximum covariance and the variance) as a function of the measured flux using t-phot (shown in log μJy) in the A2744 cluster field. Left: Ks; right: IRAC 3.6 μm. The horizontal line, at log ci = 0.0, indicates a reference value of reliability for the measured flux. See text for more details.
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