Fig. 6

PC1 versus PC 2 scores plot (A) showed specimens collected by Grant compared with those acquired by Grant when working with Cairn. B Specimens collected by Grant and Cairn were described predominantly by As (PC1) while specimens acquired by Grant working alone were mainly described by Fe (PC2). The X-Explained Variance plot (C) showed that a single principal component, PC1, explained the majority of differences in elemental content between the groups