Same as Fig. 2, with the best fitting ellipse plotted in black (e.g., the lowest χ² value) and the lσ-level ellipse plotted in grey. The green spot in the center of the ellipses represents their respective centers. The Paris chord was shifted forward by 0.9 seconds for the best alignment with the other sites (see text for details). The green line below the ellipses is the negative chord observed from the Forcarei site.