[Ba/Fe] (top left panel), [Y/Fe] (top right panel), [La/Fe] (bottom left panel), and [Cu/Fe] (bottom-right panel) as a function of the age of Galactic open clusters with 7.5 < R_GC< 9 kpc. The ages are from Cantat-Gaudin et al. (2020): the typical uncertanties for log t young clusters is 0.15–0.25, while for old OCs it is 0.1–0.2. The stars represent the estimates derived in this work. The other symbols represent estimates from the literature: red circles from D’Orazi et al. (2009); empty diamonds from Maiorca et al. (2011); purple crosses from D’Orazi et al. (2012); inversed triangles are De Silva et al. (2013); grey squares from Reddy & Lambert (2015); the black diamond from Biazzo et al. (2017); blue triangles from Magrini et al. (2018); brown pentagon from Frasca et al. (2019); light pink triangles are from Casamiquela et al. (2020); empty circles are from Donor et al. (2020), but only the measurements for those clusters with reliable membership determination (q_ flag = 1,2); empty x-crosses from Spina et al. (2021).