Fig. 2From: Quantification of postural stability in minimally disabled multiple sclerosis patients by means of dynamic posturography: an observational studyCoP displacements (black lines) and Confidence Ellipse Areas (blue lines) of a healthy subject a and b and a patient with MS c and d recorded during Not-Perturbed Test (NPT) a and c and Perturbed Test (PT) b and d Back to article page