Internal profile of the dimensionless spin parameter at the limit of stability for f = 0.2%, T_c = 1.5 × 10⁸ K, and μ = 0.6, as a function of the mass-coordinate and for a choice of hylotropes with indicated φ_core. The surface of each hylotrope is indicated by a white square. The black dashed curve shows the angular momentum accretion law (43). The red dashed curve and the red square indicate the limits for black hole formation, according to the criterions discussed in Sect. 4.3.