Figures 1 and 2:
Neutral hydrogen distribution (top) and mean velocity field (bottom) of
the galaxy NGC 7552.
The HI velocity field of NGC 7552 indicates a warp of the outer gas layer.
375-m ATCA data (12 h on-source) from 9-8-1995 * B. Koribalski
(C419). More data has been
taken with the 750A and 1.5A arrays (check).