Comparison of our entropy with the one calculated by SR18 (from Fig.1 of their supplemental material) for T = 10000 K and various helium fractions x_He. The two panels show results for values of Wigner-Seitz radii of r_s = 1.4 a₀ and r_s = 1.25 a₀ respectively. Each panel displays our calculations (red) of the total entropy (computed using Eq. 2 with CMS19-H, CMS19-He and our table for ΔS) and also the entropy without including the entropy of mixing ΔS (hence corresponding to XS_H + YS_He). Results from SR18 are shown in black.