Appendix 1—figure 1. The gradients of the deformation along the longitudinal direction of an indented cylinder.

Gradients of $\mathbf{𝐮}$ computed by using numerical simulations for soft ($p/E=4\times {10}^{-4}$, blue) and stiff ($p/E=0.01$, red) shells. Note their moderate amplitude even for the indentation of 10 μm shown here, which is the strongest that we consider.