Baroclinic results depicting growth rates for varying values of the density ratio δ against the separation parameter Δ. Shown are the growth rates for fixed values of h₀( ± ∞), h₁( ± ∞) for Keplerian shear (q = 1.5) and ξ = 0.05. The range in separation values Δ in which instability occurs is reduced as δ is reduced. The growth rates are reduced as well. The implications are that interlayer interaction is weakened with a reduction of δ.