898907.fig.004a
(a)
898907.fig.004b
(b)
898907.fig.004c
(c)
Figure 4: The geometry of the 1987A-glowing beam/jet, initially opaque shroud, and UV flash (which may have an enhanced beam of its own in the jet direction here , down and to the right). The maximum velocity of the jet/shroud is 0.95/0.55 c. The dashed line to the upper scale flags the center of the emerging jet at day 3.3 ((a)—A) and day 6 ((b)—B), and the UV flash hitting the polar ejecta at day 7.8 ((c)—C).