Notes. Models without counterrotation are marked by † (δ = 1). Here Σ₁(R = 0) is the central value of the surface density of the primary component, h₂ is the exponential scale length of the density distribution of the second component (for the first component, h₁ = 3 kpc), σ_R1(R = 0) and σ_R2(R = 0) are the central values of the velocity dispersion for each component, Q₁(R = R^∗) is the minimum value of the one-component stability parameter of the host component, and Q_eff(R = R^∗) is the effective two-component stability parameter according to Eq. (7) evaluated at R^∗. Initial values of the velocity dispersion ratio for the two components are constant with radius for all models. The definitions of the density ratio α and of the temperature ratio β are given in the text; also these parameters are generally constant with radius, except for models Kb and Kc, for which the values listed here are taken at R = R^∗, that is, the location where Q₁ has its minimum. Model I10 considers the case of exactly equal but counterrotating disks, which is unlikely to occur in real systems.