A sample of 433 planetary nebulae (PNe) overlaid on the stellar isophotes of NGC 5128, where Reff
5 kpc.
The PNe marked with circles have negative relative velocities, and
the PNe with crosses have positive velocities.
marks the position of the rotation axis.
With our proposed observations, we will be able to obtain data of
comparable quality for a much more representative sample of
elliptical galaxies.
From Hui et al. (1995).