Left panels: distribution of Δ [X/Fe] versus T_C slopes when the abundance ratios are measured with respect to the average of all stars. The dotted lines represent the distribution of slopes of data with no depletions and pure observational noise. Right panels: as in the left panels, but for the case when the abundance ratios are measured with respect to the average of stars with pristine composition. The dashed line is at zero slope. The top (bottom) panels correspond to our warm (metal-rich) sample.