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Figure 2
Hierarchical cluster analysis (HCA) of (a) an untreated mature male damselfly wing, in comparison with (b) a dewaxed mature male damselfly wing. The HCA results in each case were obtained using spectral information in the ranges 3020–2800 and 1830–1000 cm−1 with three clusters for intact and dewaxed wings (scale bar 40 µm).

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