Fig. 4
From: Presenting the Compendium Isotoporum Medii Aevi, a Multi-Isotope Database for Medieval Europe

(a) Bayesian spatial estimates of δ13C and δ15N mean values for human bone collagen in 200 CE (left column) and 500 CE (middle column) and mapping of differences in isotopic values (Δ13C and Δ15N, right column). (b) Bayesian spatial estimates of δ13C and δ15N mean values for human bone collagen in 500 CE (left column) and 800 CE (middle column) and Bayesian mapping of differences in isotopic values (Δ13C and Δ15N, right column).