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Calibrated age ranges of the Neanderthal specimens from Engis and Fonds-de-Forêt caves. The calibrated ages were obtained using OxCal 4.5 (87) and the IntCal20 calibration curve (88). Dates obtained on collagen in Groningen are reported in red. Dates obtained on collagen and hydroxyproline at the ORAU are reported in blue and green, respectively.
