Coverage in parameter phase-space of our galaxy sample. The parameters include absolute magnitude MB, central velocity dispersion
c,
rotational importance (v/)*,
isophote shape C4 (< 0 for boxiness, > 0 for diskiness),
luminosity concentration Tphot,
and environmental density (roughly indicated by 
env).
The filled squares show galaxies expected to yield >= 250 PNe,
and the open squares show those with ~ 100 PNe.