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(Left column) Angle estimates from the last three minutes of a 1 hour test of the manumeter. Estimates taken using the manumeter are shown in solid dashed red, and estimates taken with the manumeter are shown in solid blue. (Right column) Correlations between the two measurement devices. The minor axes of the ellipses fit to the data enclose 95% of the data in the error direction as defined using principal component analysis (r = radial, u = ulnar deviation; f = flexion, e = extension).
