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Figure 2
Sequential images of a single sliding event taken from a pile of PMMA microspheres by subtracting the initial image at time t0 from the images at time t. The sliding depth (open red arrows) propagates with time up to 25 s while the sliding angle (closed yellow arrows) decreases after 25 s, suggesting two distinct mechanisms.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 6| September 2010| Pages 817-820
doi:10.1107/S0909049510035363
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