Fig. 2From: Thermoelastic instability on a frictional surface and its implication for size effect in friction experimentsNumerical approximation to the integration kernel \(\mathrm{erfc}(\sqrt{s})\) (Eq. (27)). a The kernel and residual of the approximation. b Optimized parameters \({s}_{i}\) and \({a}_{i}\)Back to article page