Carved in stone: Experimental criteria for identifying Paleolithic bas-relief production techniques and sculptors' expertise.

Mean density of furrows shows an increasing trend from novices to the expert (e.g., for PDPC, Novice: 15.00 ± [14.19, 15.89] cm/cm 2 , Intermediate: 15.63 ± [15.13, 16.34] cm/cm 2 , Expert: 16.35 ± [15.04, 17.75] cm/cm 2 ), except for ScS ( Fig 14 ).

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Three parameters, Sal, Spc, and MedianAsfc, exhibit a decreasing trend from pecking to scraping, and from the latter to polishing ( Fig 7 ; S4 Table in S2 File ).

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