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. 2017 Jul 19;14(132):20170310. doi: 10.1098/rsif.2017.0310

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© 2017 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 1. — Model of the gula cuticle of the beetle P. marginata (the sketch in the top-left corner) with different distributions of the elastic modulus across the thickness. (a) Continuous linear stiffness profile (C-LIN), (b) continuous exponential stiffness profile (C-EXP), (c) continuous generalized logistic stiffness profile (C-LG), (d) discontinuous linear stiffness profile (DC-LIN), (e) discontinuous exponential stiffness profile (DC-EXP), (f) discontinuous constant stiffness profile (DC-CST) and (g) constant stiffness to the same as that of the exocuticle (EXO). The red curves show the variation of the elastic modulus through the thickness of the model. (Online version in colour.)