(color online) (a) Snapshot of atom position at 650 K. Colours represent the displacement of atom during the time interval of 1000 fs. (b) Non-Gaussian parameters α for liquid Al versus time at varying temperatures. (c) Maximum of the non-Gaussian parameter α depicted in the semi-logarithmic scale against . The red line is the Arrhenius fitting for high temperature (HT fit), and blue line for low temperature (LT fit). At temperature around , a kink is observed.