Plots of scattered radiance as a function of angle from the sky plane, ξ, relative to the observer, shown across a range of elongation angles (lines of sight). The vertical bars represent the angle of closest approach to the Sun of each line of sight. The ordinate shows (a) the total scattered radiance (dB) and (b) the (excess) polarized component of the scattered radiance (d(pB)). From Figure 2 of Howard et al. (2013a).