Orbital evolution of four different size planetesimals under the effects of a nonlinear gas drag in the γ-Cephei system. Black dots correspond to m_A = 1.59   M_⊙ and gray to m_A = 1.18   M_⊙. In both cases the parameters of m_B are those given by the best fits and detailed in Eqs. (20). The gaseous disk has a constant eccentricity of e_f = 0.05 and a rigid retrograde precession rate with period 2π/|g_g| = 1000 yr. In the lefthand panels, the orange curve shows the forced eccentricities as a function of the semimajor axis. In the righthand plots, the orange curves marks ϖ = 0.