Row-slices across the Moon, through disc centre, on two nights, to illustrate halo profiles and intensities. The upper row is from a night when the B and V halos did not cancel, while the lower row is from the unique night JD 2 455 945.17, when the halos did cancel on the DS part of the lunar disc. The left column shows profiles (B is in blue, and V is in red; V is the upper profile), while the right column shows the B/V flux ratio. Horizontal dashed line shows the zero flux level. Vertical dashed lines show the disc edges. Orientation of DS and BS are as in Fig. 1. A colour version of this figure is available online.