Top: radial metallicity gradient in our sample. The floating mean [Fe/H] (thick black line) shows a clear decrease of [Fe/H] with distance to the galactic center. The thin black lines indicate the 1-σ uncertainty interval. Red symbols show the same trend from independent subsamples of ~ 30 stars and the red dashed line shows the best linear fit to this trend. The data are in reasonable agreement for a linear slope, for which we find best fitting parameters of −1.28 ± 0.25 dex/degree, corresponding to −0.50 ± 0.10 dex/kpc. Small, gray symbols show the actual distribution of star in our sample. Bottom: no significant radial age trend in our sample within the spatial coverage of our sample. When a linear function is fit to the data, we find a slope of −1.73 ± 1.96 Gyr/degree.