Cumulative distribution functions (CDFs) of C/O, N/O, and Mg/Si. In panel a: cumulative C/O_D distributions for dwarf stars. Solid orange and red lines represent low-mass (M_p < 30 M_⊕) and high-mass planet (M_p > 30 M_⊕) hosts, while the solid blue line displays the comparison stars. Black lines represent the same as coloured, but only taking the stars with thin-disc kinematics. Panels b, c: cumulative C/O_G; N/O_G distributions for giant stars. Panel d: cumulative Mg/Si distributions for all stars with planetary companions and the comparison sample.