An illustrative example of χ² overestimation for bright objects. The upper panel displays the light curves and SPM fits for SN 2024iss (red dots) and SN 2024jfg (blue dots), while the bottom panel shows their residuals. Within the upper panel, we report the number of observations, peak flux, and χ_dof². The dashed lines in the bottom panel represent the values for three residual standard deviations. This example demonstrates how brighter objects with smaller residuals and lower relative errors can lead to an overestimation of χ².