Adiabatic entropy (sad) from 3D simulations of a particular chemical composition, presented along different projections of the ﹩\mathrm{log}g﹩–﹩\mathrm{log}{T}_{{\rm{eff}}}﹩ plane. Variation in simulated entropy follows a single value functional form when presented against a particular projection that is aligned with the adiabats. The lower panel is the projection that shows the least scatter in a regression model, which is the projection that is aligned with the adiabats (i.e., the contours in the lower panel of Figure 1).