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. 2013 Sep 30;110(42):16742–16747. doi: 10.1073/pnas.1307520110

Fig. 3.

Fig. 3.

Isopach maps for Samalas plinian and phreatoplinian fall deposits. (A) Samalas F1 compared with the F4 Plinian fall unit of Tambora A.D. 1815 (20, 21). (B) Samalas F2 Phreatoplinian fall unit. (C) Samalas F3 Plinian fall unit. Isopachs were mapped for the F1, F2, and F3, from 44, 22, and 18 thickness measurements in the field, respectively. Interpolation of the data using a multiquadratic radial model was the first step in constructing the final isopach maps. Although much less widespread than the F1 unit, the distributions of the F2 and F3 units are both broader than the main Plinian fall unit of Tambora 1815.