Fig. 3.

Strain dependence of solid surface stress, ϒ($ϵ$). The points indicate the average surface stress and average local strain for droplets on the same substrate. The error bars are the SD of the population. The dashed line is a linear fit, providing the surface modulus, Λ = 126 ± 6 mN m⁻¹ and zero-strain surface stress, ϒ₀ = 19 ± 3 mN m⁻¹