Details of the average ejecta velocity measured for large grain target impacts as a function of the projectile impact velocity. The error bars shown are the mean absolute deviations of ejected grain velocities for each impact. Small symbols: mm-sized grain target. Large symbols: cm-sized grain target. Green symbols: mixed grain target. Red symbols: impacts onto fine JSC-1 grains measured in Colwell et al. (2008) and Brisset et al. (2018). The dashed and dotted lines show the exponential fit for impacts at > 40 cm s⁻¹ into the mm- (fit index 0.54) and cm-sized targets (index 0.46), respectively. The red line shows the exponential fit determined in Brisset et al. (2018) for impacts into JSC-1 fine grain targets, which has an index of 0.50.