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. 2017 May 4;8:15294. doi: 10.1038/ncomms15294

Figure 4. The integrated intensities.

Figure 4

I(T) of the difference DPDF, Δg(r, E), between the DPDF at temperature T and that at high temperature, 2.85 K for experiment and 2.5 K for simulation, (a) over the roton peak (r=3.4–4.6 Å, E=0.65–0.99 meV) and (b) the anankeon peak (r=2.0–2.6 Å, E=0.15–0.45 meV). Circles for experimental results and stars for PIMC simulation results. The solid lines are for the expected temperature dependence of the order parameter, equation (2), with I(0)=0.76 for the roton peak and 0.16 for the tunnelling peak. The vertical bars in circles indicate statistical error. The errors for the PIMC results are smaller than the symbol.