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Hydrogen mean square amplitudes 〈u2〉 – 〈u2〉(Tmin) plotted as function of temperature for the different samples and conditions. Experimental errors in 〈u2〉 are shown. The solid lines correspond to linear fits of the data points for Tmin < T < 150 K as described in Materials and Methods. (D) Line a corresponds to the error-weighted fit, and line b corresponds to the fit with equal weights attributed to the data points.
