W_DIB completeness estimate over the A₀ and σ₀ ranges tested using mock DIB features. The blue shaded panel indicates the fraction of well-detected features in the input A₀ − σ₀ field (see the text). Bottom: completeness as a function of |A₀|, averaged over the range of input σ₀ (black) and for three sample σ₀ values (blue: 0.9 Å, green: 3.6 Å, red: 7.5 Å). Right: completeness as a function of σ₀, averaged over the range of input |A₀| (black) and for three sample |A₀| values (blue: 0.02, green: 0.05, red: 0.09).