Fig 3.

Boxplot showing the (A) δ¹³C and (B) δ¹⁵N values of human samples from Early Neolithic to Early Iron Age. Human isotopic values were combined with previous published data on the GHP from Early [76], Middle [22,25] and Late Neolithic [25], together with Early and Middle Copper Ages [25]. Genetic affinities are based on [13]. The dots within the boxes represent individual values of the samples; the horizontal line within the box represents the median value; the vertical lines represent the range of data.