The shell between the LBV and O star at five different points in time, starting 1/5th orbit after Figs. 3–6 (red) and at each 1/5th orbit thereafter (green, blue, yellow) The final shell (white) coincides with the righthand plot in Fig. 7. The shells are defined as an isosurface contour drawn at a velocity of 300 km s^-1 (see also Fig. 3). The global shape of the shell remains constant over time, rotating rigidly about the center of mass of the binary (0, 0). Local instabilities vary, but retain the same general characteristics, being small between the stars, but much larger in the advancing and trailing ends of the shell.