Entropy proxy plateau as a function of normalised radius at the age of the Sun for solar models including the following effects: standard model with reference physics, denoted SAHA-S Std; inclusion of macroscopic mixing at the BCZ, denoted SAHA-S Dt, following Buldgen et al. (2025a); change of the equation of state FreeEOS-Std; change of the modelling of convection in the envelope, denoted SAHA-S CM Std. The entropy proxy profile of a seismic model is provided for comparison.