Top: comparison of the Cepheid (black dots) metallicity gradient with iron abundances for open clusters younger than 3 Gyr. The color coding refers to different subsamples: BOCCE project (red); cluster ages from Salaris et al. (2004) and distances from Friel (1995) (blue); Carraro et al. (green); WEBDA (yellow). See Table 5 for individual values and references. The vertical and horizontal black error bars in the bottom right corner show the mean uncertainty on Galactocentric distances and iron abundances for OCs in the above subsamples. The dashed line shows the metallicity gradient based on the selected open clusters. Bottom: same as the top, but for cluster ages older than 3 Gyr. The yellow cross marks the position of the subsample from Yong et al. (2012). The dashed line shows the metallicity gradient based on the selected open clusters.
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