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Notre-Dame de Paris: The first iron lady? Archaeometallurgical study and dating of the Parisian cathedral iron reinforcements

Fig 14

SI composition regarding their location in sample NS7-T.

Composition clusters (blue, green, red) were determined by HCA on Xij data. The clusters were then plotted on binary graphs highlighting differences in Al₂O₃/SiO₂ and K₂O/CaO ratios between the clusters.

doi: https://doi.org/10.1371/journal.pone.0280945.g014