Pressure difference between quark matter and APR nuclear matter for ﹩a_{4}=0.7﹩, ﹩a_{2}=( 150\ \mathrm{MeV}\,) ^{2}﹩, illustrating how the near‐identity of their p(μ) relations leads to difficulties in defining a unique transition density. In the left panel, the solid curve is for ﹩B^{1/ 4}_{\mathrm{eff}\,}=141.2﹩ MeV and shows three transitions, the first occurring at ﹩\mu =324.4﹩ MeV, corresponding to ﹩\rho _{c}=1.5n_{\mathrm{sat}\,}﹩ (Fig. 1). Raising Beff gives a transition at higher μ, but it is technically impossible to achieve a (first) transition in the range ﹩338\ \mathrm{MeV}\,< \mu < 458﹩ MeV (﹩1.9n_{\mathrm{sat}\,}< \rho < 4.3n_{\mathrm{sat}\,}﹩): at ﹩B^{1/ 4}_{\mathrm{eff}\,}=141.5﹩ MeV (dashed curve) the transition jumps from the bottom of this range to the top. The right panel illustrates how this translates to a discontinuous behavior in dependence of ρc on Beff.