The scaling relation of the peak current with the imposed η value. The data points represent two series of experiments with different imposed driving velocities. The diamonds and the associated full line represent data with V_d = 0.05. The triangle represents the corrected η for the left most point as indicated in the previous graph, with the dot-dashed line being the correspondingly altered scaling. The crosses and the dashed line represent the data with V_d = 0.1 (with the star showing the corrected η value). The dashed line represents Eq. (3), the full line Eq. (4) and the dot-dashed line Eq. (5).