Imaginary part of the component of surface pressure variations as a function of the normalized forcing frequency in the reference case (a = a_Venus and p_s = 10 bar) with a CO₂-dominated atmosphere.Numerical results obtained with GCM simulations are plotted (grey points), as well as the interpolating function f_GCM (dashed greyline), the odd and even functions of σ defined by Eqs. (6) and (8) (solid black and purple lines, respectively), the Maxwell function given by Eq. (17) (red dotted line), and the parametrized function given by Eq. (24) (blue dashed line) with the parameters: a₁ = 0.549, b₁ = 2.52, a₂ = − 1, b₂ = 3.94, χ₁ = 0.798, d₁ = 0.072, χ₂ = 1.35, d₂ = 0.0098, and b_trans = 2.59.