Fig. 1.

Linear regression analysis. a, the estimated date of birth (DOB) based on ¹⁴C analysis (y axis) and the actual date of birth (x axis); R² = 0.996, p < 0.001. b, the estimated date of birth based on aspartic acid racemization analysis (y axis) and the actual date of birth (x axis); R² = 0.923, p < 0.001. For details regarding each case, see Table I and supplemental Table 1. The two ¹⁴C cases giving prebomb values are omitted.