Left: [Mg/Si] versus [Fe/H] for stars without detected planets (black dots), stars hosting low-mass planets (blue squares), and stars hosting high-mass planets (red filled circles). Cumulative distribution of [Mg/Si] (top right), [Mg/Si] after correcting for the Galactic chemical evolution (middle right), and [Fe/H] (bottom right) for stars with and without detected planets. The black solid line provides linear fit to all the data points and the green dashed line shows separation between Galactic thin- and thick-disk stars.