Extended Data Fig. 6: PHI vs. Ithaca’s dating distance in years for disputed Athenian decrees.

The box plot shows the median and the mean of the distribution, the bounds of the boxes are defined by the first and the third quartiles and the whiskers by the minimum and maximum values of n = 21 inscriptions. Ithaca’s chronological predictions (average distance of 5 years from the modern “lower” ground truth) compared to PHI meta-data for time intervals (older estimates, average distance of 27 years from the modern ground truth). Lower distance in years is better. Exploiting the features of our full dataset, Ithaca’s predictions are better and closer to modern re-evaluations compared to the original PHI ground-truth dates. The latter reflect the dates assigned by the published editions which PHI is reporting, and which almost all reflect the old three-bar sigma dating. We refer the reader to Extended Data Table 3 for detailed results.