Radial distributions of [Fe/H] for our open cluster sample (first panel: filled circles in grey the youngest clusters, age < 2 Gyr, and in blue the oldest ones), for the Netopil et al. (2016)’s open clusters with high-resolution metallicities (second panel: filled hexagons in grey the youngest clusters, age < 2 Gyr, and in blue the oldest ones), for the APOGEE (Cunha et al. 2016) and Cantat-Gaudin et al. (2016)’s open clusters (third panel: green triangles and cyan squares, resepctively), and for the Cepehids (fourth panel: stars and pentagons Martin et al. 2015; Genovali et al. 2014, 2015, respectively). The black curves represent the gradients of the elements over Fe in the K15-improved model at the present time – updated with the new yields of the present work – while the red and blue ones corresponds to 2 Gyr and 5 Gyr ago, respectively.