Illustration of how t-SNE works in abundance space, using the Delgado Mena et al. (2017) sample. The small panels show eleven of the possible ∼20 000 abundance diagrams that can be created from 13 elements. The resulting reference t-SNE projection of the full abundance space is shown in the big panel, and several identified sub-groups are indicated. For reference, the Sun would be found very close to the solar-abundance twin HD 212036 ([Fe/H] = −0.01, [X/Fe] = 0 + −0.05 for all measured elements X), which is located at (X_{t − SNE}, Y_{t − SNE}) = (−4.57, 1.46).