Distribution of pixels in the PSF-homogenized, noise-equalized NIRCam maps (top panels) and χ² distribution for the quadrature sum of the four NIRCam S/N maps (bottom panel). We show the distributions without truncation (black), with positive truncation ${\chi }_{+}^2$ (blue), and with negative truncation ${\chi }_{-}^2$ (red). The χ² distribution for degrees of freedom N = 4 and N = 2 are shown in dark and light dashed gray lines. The distribution of the sources’ maximum ${\chi }_{+}^2$ values that are recovered by the hot+cold catalog are shown in the green histogram. Vertical lines mark the equivalent of 3, 4, and 5σ thresholds for χ² distributions with N = 2.