Surface elemental abundances for main sequence stars, BSGs, and RSGs as a function of luminosity. The x-axis represents log(N/N_i), where N is the elemental number fraction and N_i is the initial value. The elements are indicated in the leftmost panels. Abundances are sampled at 0.1 Myr intervals for all models within the main sequence band during the core hydrogen burning phase. For BSGs and RSGs, abundances are selected at the midpoint of core helium burning (Y_c = 0.5). Data points are stacked such that those with higher Y_s appear above those with lower Y_s. For single-star models, lines indicate the limits for different initial rotational velocities (the legend in the top-leftmost panel) for main sequence and RSG stars. In the case of BSG single stars, the boundaries that single-star models exhibit while crossing the BSG region left to right (red) and right to left (blue) are shown.