Absolute radial velocities of RGB stars in 47 Tuc, |Δv_r|, plotted versus the abundance (left) and abundance-abundance ratios (right) of Na, Mg, and K. Measurements of individual stars are shown as small filled circles while the absolute radial velocities averaged in 0.1 dex-wide non-overlapping abundance bins are plotted as large open circles (error bars in the latter case measure RMS scatter of |Δv_r| in a given abundance bin). Symbol color denotes quality (class) of the spectral lines from which the abundance was determined (see Fig. 4). Solid lines are linear fits to the data of individual stars, with the p-values (see text) marked in the corresponding panels.