Statistical quality of Ra-Shalom pole solutions given in sinusoidal projection of the sky in ecliptic coordinates. The grade of shading and the scale bar on the right indicate the χ² of the fit divided by the number of data points. The formally best-fit case with λ = 313° and β = − 45° is marked with a full circle. The solid line shows the contour with the χ² value 8% higher than the minimum value of the best-fit solution. It represents our region of admissible solutions. The pole of the orbital plane corresponding to 180° obliquity, shown by the triangle, is located close to this zone.