Chemical-abundance patterns relative to iron for the t-SNE-selected subsamples of the HARPS survey, using the same symbols and colours as in Fig. 1. For each population we show the median abundance trend, as well as the full abundance distribution (for the top two panels). For visibility, we divided the sample into three groups that are shown separately in the three panels. The “thin disc” population (black circles) is shown in all panels for comparison.