Fig. 2.
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The entropy values resulting from the 1000 trials of clustering analysis carried out by OPTICS on a data set that is randomly ordered (blue histogram), and on a data set that was sorted as a function of [Fe/H] (green histogram). Finally the red vertical line shows the entropy that is obtained when the data set is sorted as a function of the [X/H] abundances, starting with [Fe/H] followed by all the other elements.
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