Contours of the binary penalty function in the space of the cone opening angle α_c and the latitude direction of ejection φ_A2, after optimizing over θ_A2 and v_dmax. The left panel is the fit for the best estimate of the envelope, and the right panel is the most discordant (green) fit from the envelopes in Fig. 3. Units are arbitrary, and there is no statistical interpretation of the contour values because they are not χ² values. For the best envelope, there is a clear optimum at φ_A2 = −20° and α_c = 40°, denoted by a plus symbol. The optimum is shifted only slightly for other assumed envelopes.