Distribution of distances in the t-SNE projection for stars with similar atmospheric parameters to the Sun, using the GES catalogue for the sample and spectral region R2. The absolute values of the differences in T_eff, log g, and [Fe/H] are shown in the left, centre, and right panels, respectively. In each panel, the red horizontal line indicates the adopted parameter thresholds; green points represent the similar spectra which fulfil all three of the parameter thresholds, and the green vertical dashed line marks the 75th percentile of their distances from the reference.