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Nitrogen (A) and carbon (B) isotopic offsets between the children from birth to seven years of age and average values of the females from La Bastida (purple) and Gatas (yellow). The horizontal lines and error bars mark the female averages ± one standard deviation and the value 2‰, resp. 3‰ above it, a range that is widely considered typical for breastfed children [65, 67]. The dotted lines are moving averages of the isotope values of the children.
