C/Si versus O/Si for our stars (blue points) and those (in grey) analysed by Biazzo et al. (2022). Squares and circles represent targets hosting only planets with M_p < 30 M_E (low-mass planets) and M_p > 30M_E (high-mass planets), respectively. Diamonds mark those targets hosting both higher- and lower-mass planets, while the cross symbol indicates that planet-hosting target without any planetary mass measurement. The typical uncertainty was estimated referring to the methodology used by Delgado Mena et al. (2010) and it is shown on the top left corner. Dashed lines represent the solar abundance ratios by Biazzo et al. (2022).