Mean specific angular momentum over the shells as a function of the mass coordinate at different evolutionary epochs (ZAMS, TAMS, core helium exhaustion, and the last calculated model) in Seqs. m30vk02, m30vk06, m200vk06 and m500vk04, as indicated by the labels. The thin sold line labeled j_Kerr,lso denotes the specific angular momentum for the last stable orbit at the given mass of a black hole, assuming that all mass below forms a rotating black hole. Here, if the contained angular momentum is higher than that of a maximally rotating black hole, the black hole is assumed to rotate maximally.