Variation of median standard deviation as function of the number of clusters K in the synthetic data set. The solid black lines represent the median standard deviation of the classes in a run. The solid horizontal grey lines show the median standard deviation at K = 69. Dashed black lines show the input standard deviation. The top left panel refers to α abundances [α/M], the top right to metallicity [M/H], bottom left to logarithmic surface gravity log g, and the bottom right to effective temperature Teff.
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