1. Department of Anthropology, Pennsylvania State University, University Park, PA 16802, USA
2. Center for Quantitative X-Ray Imaging, EMS Energy Institute, Pennsylvania State University, University Park, PA 16802, USA
3. PAVE Research Group, Department of Archaeology and Anthropology, University of Cambridge, Cambridge CB2 1TN, UK
4. McDonald Institute for Archaeological Research, Department of Archaeology and Anthropology, University of Cambridge, Cambridge CB2 1TN, UK