Structural profile of 0.154 M_⊙ model as a function of its age. The puffing up and later contraction of the star are seen here. The black circles (black squares) represent 50% (90%) of the stellar mass. The dashed-dotted grey line is the degeneracy limit above which gas pressure dominates. The two grey lines in the bottom right are the crystallisation limit for carbon and oxygen. Dotted regions are convective.