Entropy as a function of total pressure for the solar model. The thick gray line is the temporally and horizontally averaged entropy in the 3D model, and the thin blue lines are those in the 1D models with different values of the mixing-length parameter α, which are indicated near the blue lines. For the 1D models shown in this figure, CM and the VAL-C T(τ) relation were used. The horizontal dashed red line indicates the asymptotic entropy of the 3D model, s_asy.