Δ[E1/H]-T_cond slopes as a function of stellar parameters and planetary mass. The stars are colour-coded according to their number of confirmed planets. The symbols are the same as in Fig. 4. The red line represents weighted linear regression fits to the data, while the black dotted and dashed lines correspond to dwarf and giant star hosts, respectively. The slopes and Pearson correlation coefficients are shown in the corners of the panels. See the text for more information.