Figure 4.

Threshold and slope with associated error bars determined from the regression analysis between stone comminution (SC) and ${\stackrel{‒}{P}}_{+\left(avg\right)}$ and ${\stackrel{‒}{E}}_{eff}$ in water and 1,3-butanediol after 1000 shocks for three size groups : 4 mm (green), 7 mm (blue), and 10 mm (red)