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. 2023 Nov 1;18(11):e0291552. doi: 10.1371/journal.pone.0291552

Fig 18. Three-dimensional representations of the surfaces of four gravels from different sites.

Fig 18

The Landry gravel (A) has a Sq of 0.98μm and a Sdr of 4.45%, its surface is of intermediate roughness. The Casserole gravel (B) is quiet similar to Landry one. The Fourneau du Diable gravel (C) has a Sq of 0.84μm and a Sdr of 4.98%, it is characterized by a regular luster. The Laugerie Haute East gravel (D), Laugerie Haute West gravel (E) and Pech de la Boissière gravel (F) also present a regular luster. The gravel from the Landry’s sieves (G) has a Sq at 1.69μm and Sdr at 16.4% and the gravel from Croignon (J) shows a Sq values at 1.75μm and a Sdr at 16%. They are both characterized by a rough surface. The Campagne gravel (H) and Maguelone gravel (I) present similar values than (G) and (J) and their surfaces are rougher. These visualizations highlight the folds of the glossy surfaces as well as the shape of the histograms on the Z-scales expressing the distribution of the points with respect to the average plane of the surface.