Methods and Supplementary Figures 1 + 2 from Elasticity and energy dissipation in the double network hydrogel adhesive of the slug <i>Arion subfuscus</i> FungT.-M. Gallego LazoC. SmithA. M. 2019 This provides the detailed methods, supplementary figures 1 + 2, and a paragraph discussing the results in context with some previous measurements.