t-SNE projection of approximately 420 000 RAVE spectra. The scaling in both directions is arbitrary, therefore the units on the axes are omitted. The colour-scale corresponds to the gravity of the stars as computed by Kordopatis et al. (2013). Giants are shown in red and dwarfs in blue. Lighter shaded hexagons include fewer stars than darker ones. Over-plotted black dots indicate locations of the stars from this study.