13 Gyr isochrone and three stellar evolution tracks with M_init = 0.90, 0.95, 1.00 M_⊙. The left panel shows the entire span of a 13 Gyr isochrone (black) and the 1 M_⊙ track (green). The 0.90 (red) and 0.95 M_⊙ (blue) tracks are only plotted from the pre-main sequence to the end of the RGB phase for clarity. The right panel focuses on the main sequence, subgiant branch, and red giant branch. The isochrone is plotted as a solid line for all points that satisfy M_init < 0.95 M_⊙ and as a dashed line elsewhere. Finally, the point at which each track has an age of 13 Gyr is shown as a filled circle; for the 1 M_⊙ track, this point is only visible in the left panel.