Fig. 1.

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Left: silhouette plot of the divisive HC applied to the low-resolution spectroscopy data set for a two-group split. Right: same as in the left panel, but for a three-group split. The bars correspond to the silhouette values of objects clustered in the first group (red), in the second group (blue), and in the third group (green). The average silhouettes for the groups are listed along with the group sizes.
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