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Ratios of carbon and nitrogen stable isotopes of the ancient remains from the Cave of Santimamiñe. (a) Distribution of the samples into the four (theoretical) extreme human dietary types as Richards and Hedges46 based on their stable isotope content. (b) Evolution of δ13C content in human remains from the Cantabrian region over time (age of the samples is based on 14C dating, without calibration) modified from Arias47 to include samples from our study.
