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Correlation circle of the Component Analysis illustrating the contribution of taking into account 5 isotopic ratios (based on data from Marcoux (1986) and Nimis et al. (2012)): 206Pb/204Pb is strongly anti-correlated with the ratios normalized on 206Pb, which allows the angle to be opened. The ratios normalized on 206Pb are then the extremes of the model.
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