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Boxplots for the mean near-core chemical elemental signatures (31P, 138Ba, 86Sr and 24Mg) for all samples. Pairwise comparisons among sampling events for each trace element are represented by letters. Among sampling events, when the events share a letter, there is no significant difference between them. Horizontal lines indicate median values. Within the boxes, the upper lines indicate the quartile 3 and the lower lines indicate the quartile 1.
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