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Shifting networks and mixing metals: Changing metal trade routes to Scandinavia correlate with Neolithic and Bronze Age transformations

Fig 2

Compositional patterns of the major clusters identified among 533 samples from objects of the Nordic Bronze Age.

Plotted are the medians (black), the interpercentiles (10 and 90%) and the total ranges (minimum and maximum). Clusters #7 to #11 contained only one or two samples and are considered as outliers or were combined with a larger cluster, which is compositionally most similar. Only logarithmic concentrations of As, Sb, Ni, Ag, and Bi were used for classification with cluster analysis. The ranges of tin concentrations are merely shown to demonstrate that certain chemical groups (C#3 and C#4) were not intentionally alloyed with tin.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0252376.g002