Histograms of best-fit parameters for all stars of the LIPS sample (shaded area in grey) and the single-cloud sight-lines (shaded area in red). The intersection of both samples is shownas red-grey hatched area. In the top panels we show (from left to right) the dust abundances [C]/[H]_aC, [C]/[H]_gr, [C]/[H]_PAH, and [Si]/[H]_sSi, and in the bottom panels q, , , and , respectively.