Presence of a twin branch as a function the speed of sound in quark matter (blue and red curves, left panel) and the density jump λ (dark blue and yellow, right panel) for the exemplary EOS. Only configurations with the critical values of α and λ for which a stable twin branch can be produced are shown. The high-mass twin branch segments have α in the range from 0.78 (bottom red curve) to 1.00 (top red curve) and 0.60 (bottom blue curve) to 1.00 (top blue curve). Values of λ are in the range from 1.58 (top dark blue curve) to 2.5 (bottom dark blue curve) and 1.34 (top yellow curve) to 1.48 (bottom yellow curve). The remaining EOS parameters (γ, n₁, λ, n₀ for the right panel and γ, n₁, n₀, α = 1 for the left panel) correspond to the EOS in Table 2.