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Critical evaluation of in situ analyses for the characterisation of red pigments in rock paintings: A case study from El Castillo, Spain

Fig 8

Results of PCA4 of ‘Fe-normalised’ spectra (log of Fe ratios).

On the right: coordinates of individuals; on the left: coordinates of variables.

Fig 8

doi: https://doi.org/10.1371/journal.pone.0262143.g008