Constraints on the longitude of the ascending node, Ω, as a function of the cosine of the orbital inclination. The gray shaded regions are excluded by the mass function and the estimate for the total mass of the binary system. The horizontal dashed orange line indicates the position angle of the proper motion, Θ_μ. The constraints given by ẋ_obs and its 1-σ uncertainty are displayed as solid orange lines, the constraints given by the measurement of ς are given by the blue dashed lines. These parameters are as measured with the DDH model. The grayscale maps represent the joint posterior pdf for cos i and Ω, with darker shades corresponding to higher probabilities. The marginal plots display the marginalized posterior pdfs for cos i and Ω. In the right-hand panel, the probability density increases from right to left.