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Fig. 7. Behaviour before and after the onset of independent walking. Percent of
variance of GTy data explained by the second Fourier harmonic (A)
and step-by-step variability of the plane normal (B) are plotted for
experimental sessions performed at different times before and after the first
unsupported steps. Triangles, subject R.D.C. data; circles, subject G.M.
data.