Constraints on the a − λ plane, resulting from Mmax > 2 M⊙, obtained assuming SR EOS of baryon matter, and for purely CFL cores (no 2SC layer) starting at ρCFL = 1.7ρ0,...,4.0ρ0. Densities 2.3ρ0 and 3.0ρ0 correspond to P1 and P2, relevant for the boundaries of the 2SC layer in a 2SC+CFL core. Each line is an upper boundary of the region of (aCFL,λCFL) consistent with Mmax > 2 M⊙. These lines are labeled by the density at which a direct transition B→Q(CFL) takes place.
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