Boxplot for the comparison between the elemental abundances of dwarf stars with and without planets, shown in blue and red, respectively. Two-sigma clipping was applied to all abundance distributions before the comparison, to avoid abundance outliers. The top panel shows the distributions for dwarfs in the whole [Fe/H] abundance space, whereas the bottom panel restricts the comparison to those stars having −0.25 ≤ [Fe/H] <+0.35. The original data points are shown beside each corresponding box to allow visualization of the intrinsic scatter.