Fig. 8

Stress-versus-strain series (black dots) for wet dunites with best-fit model. The red line represents the prediction of the best-fit model based on the grain-size sensitive nonlinear Burgers rheology. The grey bands represent the confidence interval, which is plotted by randomly sampling the posterior distribution taking the covariance into account. The experiments were conducted on samples with different grain sizes (Åheim with 900 \(\upmu\)m grain size and Anita Bay with 100 \(\upmu\)m grain size)