Evolutionary tracks for stars of different masses:the 0.6 M☉ track shows the RGB and stops at the helium flash.the 1 M☉ track shows a short but long-lasting subgiant branch and the RGB to the helium flash.the 2 M☉ track shows the subgiant branch and RGB, with a barely detectable blue loop onto the AGB.the 5 M☉ track shows a long but very brief subgiant branch, a short RGB, and an extended blue loop.