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Sheep skull benchmark object. a): Photo. b) Matching the photo, this shows the 3D model obtained using ATOS-II 3D scanner. c) Matching the photo, this shows the 3D model obtained using QTSculptor scanner. Details of the scratch contained on the surface were reproduced photographically (d), on the ATOS-II scanner (e) and QTSculptor (f). See text for feature description. Bar is 5 mm.
