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. 2021 Feb 17;7(8):eabe8737. doi: 10.1126/sciadv.abe8737

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Fig. 4 — (A) PDF of contact number in the upper and lower hemispheres for 8-, 12-, and 24-mm tracers. (B) Average volume fraction distribution of background particles within 4d distance to 8-, 12-, and 24-mm tracers that show the up-down asymmetry. (C) Average volume fraction ϕ of the system as a function of depth. (D) Pair correlation function between 200 12-mm tracers.