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Number correlation function for the transition of the gate half-width x between x < s = 2.4 Å and x > s. Circles are calculated from the 750-ps MD trajectory as 〈{H[x(t) − s] − po]}{H[x(0) − s] − po]}〉/〈{H[x(0) − s] − po]}2〉 (ref. 15), where H(x) is the step function. The curve is a fit to Eq. 4, which is calculated for diffusion in a harmonic potential. (Inset) Fluctuations of the gate half-width along the 750-ps MD trajectory.
