(color online) (a) The evolution behavior of the effective equations of state (blue) and (red) versus x where x = ln(a/a₀) and (b) the evolution behaviors of the density parameters of Ω_DE (blue) and Ω_k (red) versus x are represented for the non-flat universe (open case) in the case of quadratic EoS with the parameters b² = 0.1, for an interaction of n = 1 with the initial conditions Ω_DE(0) = 0.72, Ω_k(0) = 0.08 for k = 1.