Contour plot of the angular-marginalized -distribution given by Eq. (24). The contours are at 0.1 intervals with the lighter shades corresponding to larger values. The dotted and dashed curves (Eqs. (25) and (26)) trace maximums along horizontal and vertical slices and end at the red points at and , respectively. Although the “shape” of the distribution is not affected by the value of σ, the plot assumes that σ ≤ 1/4 so that the plotted values for up to 4 (=1 /σ_max) exist.