Stellar mass versus metallicity for the survey stars and histograms of both parameters. The complete sample is shown in gray; the 482 stars left after the homogenizing cuts (described in Sect. 3) are shown in blue, and the red points identify the 32 planet hosting stars within the sample. The mean uncertainties are shown in the upper right corner. The red and blue dotted lines indicate the mean stellar mass and metallicity for the targets with and without planets, respectively, for the following: planet hosts, = (1.59 ±0.51) M_⊙ and dex; and stars without planets, M* = (1.83 ± 0.79) M_⊙ and