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. 2012 Oct 5;2:712. doi: 10.1038/srep00712

Figure 2. Back-scattered electron images of selected rocks from the Campi Flegrei caldera: (a) Campanian Ignimbrite super-eruption (39 ka), and (b) Astroni eruption (3.7 ka).

Figure 2

These images were processed using dedicated programs to obtain the CSD curves by plotting population density (number of crystals per unit volume) versus crystal size (maximum length).