[X/Fe] ratios as a function of stellar ages for the nine solar twins analyzed here (circles). We also plotted the measurements from Ramírez et al. (2011), Nissen (2015), Spina et al. (2016), Yana Galarza et al. (2016), as triangles. The red triangles represent the thick disk stars. The [X/Fe]-age distributions have been fitted by the functions showed as red dashed lines, whose parameters are listed in Table 4.
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