“…Dips are the sharp drops in intensity over a narrow phase range of ∆φ ≈ 0.1 (see e.g., Greenhill et al, 1998;Giles et al, 2000;Galloway et al, 2001;Devasia et al, 2010Devasia et al, , 2011aDevasia et al, 2011b;Usui et al, 2012;. The depth of a dip can attain a very high value, 80-100% of the pulse maximum (Giles et al, 2000).…”