Predicted radio-continuum fluxes at λ = 3.6 cm for a bipolar outflow with a sinusoidal ejection velocity. The assumed parameters are v_w = 300 km s^-1, v_c = 200 km s^-1, and ω = 1.26 yr^-1. We have adopted a constant mass loss rate ṁ = 5 × 10^-8 M_⊙ yr^-1, and a distance D = 150 pc from the observer. The opening angle of the cones are θ_a = 30^o with an inclination angle θ_i = 42^o. The physical description of the plot is given in the text.