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Fig. 4

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Deformations of the surface of Model 1: the principal axes of the strain tensor are reported. Green and red lines indicate extension and shortening, respectively. Strain tensors have calculated between (a) 50 and 150 s; (b) 200 and 300 s; (c) 350 and 450 s; (d) 500 and 600 s of experiment. After 600 s, slabs are almost vertical and deformation is very slow.

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