The authors regret that the MoO3 crystal structure used as input in the RaDMaX software to simulate the XRD curves, presented in the paper mentioned above, contained a mistake in the atomic positions. The re-analysis of the data, using the correct structure, led to some changes in the absolute values of the static Debye-Waller factors, which affected the figures 2, 3 and 5. The corrected figures are shown below. These corrections do not change any of the conclusions or discussions. The authors would like to apologise for any inconvenience caused.