Correlation between the integrated and fitted equivalent widths (EW₆₆₁₄) of the DIB λ6614 feature. The horizontal axis shows the fitted EW (EW_fit), while the vertical axis displays the directly integrated EW (EW_int). The histogram in the bottom-left corner shows the distribution of the difference ΔEW = EW_int – EW_fit. Here, µ and σ represent the mean and standard deviation of the ΔEW distribution, respectively.