Fig. 1. Vibrational entropies of disorder (ΔSdisvib) of Cu_0.75Au_0.25 at 298.15 K. It is plotted against equilibrium temperature (T^eq) as a measure of SRO. LDA calculated values using 32 atoms (red data points) are compared to the calorimetric data (black data points with error bars representing 2 sd).