Distribution of σ _DHO, τ _perturb, and σ _ϵ as a function of rest wavelength (λ _RF). The color gives the photometric band from which the best-fit parameters are obtained. The black points in the middle and bottom panels mark the median values in bins centered at the corresponding λ _RF; the error bars have been made twice as large for better visibility. Top: the contours show the 85% mass for each band. σ _DHO follows an overall monotonic relation with λ _RF; the solid line shows the best linear fit. Middle: τ _perturb increases with λ _RF longward of ≈2500 Å; the solid line shows the best linear fit to the median values with λ _RF > 2500 Å. Bottom: σ _ϵ decreases with λ _RF shortward of ≈2500 Å; the solid line shows the best linear fit to the median values with λ _RF < 2500 Å.