Fig. 3: Average pixel brightness of the images over time.
From: The growth of super-large pre-planetary pebbles to an impact erosion limit
a, The range is 0 (black) to 255 (white). Vibrations were started at about 2 to 3 s and were stopped at about 6 s. The times indicated are when the velocity distributions in b–d were taken. Velocities v are 2d projections indicated as index in the y-axis label. b, Velocities at the onset of erosion (t = 4.2 s). c, Velocities at the end of vibrations (t = 6.2 s). Erosion is no longer the dominant process. Therefore, only the largest velocities in a and b are indicative of the erosion threshold. d, Velocities when the dominant collisions are no longer erosive but small aggregates reform (t = 6.5 s).
