(A), (B), (E), (F) Autocorrelation curves obtained from occlusion studies on artery and skin sites from two animals – curves were renormalized using a feature scaling technique described in section 2.3. (C), (D), (G), (H) Mean tau-half values computed from autocorrelation curves of artery and skin sites for occlusion studies on two animals – the error bars represent the standard deviation from the mean.