Fig. 4From: Comparison of trace element chemistry in human bones interred in two private chapels attached to Franciscan friaries in Italy and Denmark: an investigation of social stratification in two medieval and post-medieval societiesThe concentration of Pb (in µg g−1) as a function of Hg (in ng g−1) in cortical tissue samples. a individuals from the Iannelli crypt (red squares) and the friary cloister walk (yellow pyramids); b individuals from the Hardenberg crypt (blue circles) and the individuals excavated from the cloister walk (green diamonds)Back to article page