Comparison of the input and best-fit parameters of the mock DIB profiles: (a) amplitude |A₀|, (b) central wavelength λ₀, and (c) profile width σ₀. The top panels show the direct comparison and the 1:1 relation (dashed line), and the bottom panels show the difference (Δ = input-fit) as a function of input parameter. The contours enclose 50%, 75%, and 90% of the sample. Also shown are median fractional differences for A₀ and σ₀, the median absolute difference for λ₀, and the dispersion in each case.