Fig. 5From: A minimal markerset for three-dimensional foot function assessment: measuring navicular drop and drift under dynamic conditionsInstrumental errors. Navicular height (a) and width (b) from instrumental error assessments with a rigid marker cluster. Thin lines: single walking trials; Bold line: mean; Shaded area: standard deviation; Dashed line: rigid marker cluster reference. Errors among the stance phase (RMSENH and RMSENW) quantified as root mean square of the deviation of the mean from the referenceBack to article page