The underlying idea for a stepwise decreasing distribution of the WFs for the RCE is that room temperature introduces an energy of approximately 0.6 kcal • mol -1 to a system. Thus, the RCE are grouped into multiples of 0.6 kcal • mol -1 and every subsequent group, containing energetically higher RCE than the previous group, are weighted less because they are less likely to occur. They are calculated following equation ( ) and are visualized in figure .