Table 3. Percentage of lowest roughness areas (values of roughness final model <0.01) in the depressions and ridges identified in the artifact surfaces using the Topographical Position Index (TPI).

Anvil	Depression	Ridge
	%	%
A3	54.3	45.7
A43	24.2	75.8
A431	42.6	57.4
A/H55	35.7	64.3
A/H55FB	29.9	70.1
A/H70	44.2	55.8
H4	38.8	61.2
H4FB	34.0	66.0