Figure 20: PIXE analysis of serpentinite (antigorite): TE (Tehuitzingo, Puebla) ? ; CU (Cuicatlan, Oaxaca) ?; SL (San Lorenzo-Tenochtitlan, Veracruz) +; LM (La Merced, Veracruz) ?; LV (La Venta, Tabasco) ?. Boundary ellipses are drawn at 95 percent level of confidence interval and the variables are transformed into log10