Reference: The 3-D ionization structure of the planetary nebula NGC 6565.
Turatto et al. - A&A 384, 1064 (2002)
The fixed image at the start of the movie corresponds to the nebula as seen
from Earth (North is up and East is left)
Each movie is 80-240 Kby in size (avi) or 180-1100 Kby (animated gif).
Rotation around the N-S axis