Figure 6From: XPS characterization of (copper-based) coloured stains formed on limestone surfaces of outdoor Roman monuments“Vittoriano” sampling points and associated<Pb4f and P2p> curve-fitted regions: a) the sampling point (3) zone 2- b) the sampling point (5) zone 3- c) the sampling point (8) zone 5- see curve- fitting results reported in Table 2.Back to article page