Fig. 3

Bivariate plots of (a) Al2O3-MgO and (b) Al2O3-CaO showing the compositional groups of glass artefacts from Daoye, Daoye South and Wujiancuo

Bivariate plots of (a) Al2O3-MgO and (b) Al2O3-CaO showing the compositional groups of glass artefacts from Daoye, Daoye South and Wujiancuo