List of observers who collected data, their experience, and the order in which they landmarked the scan replicates (scanner abbreviations from Table 1).

Each observer is designated by both a number (e.g., R1, R2, R3) and an experience abbreviation: LX = low experience, MX = medium experience, HX = High experience, T = Trainer. Experience designations were assigned based on overall osteological knowledge and familiarity with 3D GM methods and practice.