Comparison between the fit and integrated EW₈₆₂₁ for 7619 measurements in the DIB catalog. Upper panel: the color represents the number density estimated by a Gaussian KDE. The gray bars show the uncertainty of the fit EW₈₆₂₁. The dashed red line traces the one-to-one correspondence. A zoom-in panel shows the distribution of the EW difference (ΔEW = EW_fit − EW_int). The mean (Δ) and standard deviation (σ) of ΔEW are indicated. Lower panel: distribution of the ΔEW as a function of the fit EW₈₆₂₁.