  HST STIS slitless spectroscopy of LMC PNs is the ideal tool to study their
morphology and their ionization structures at once. We present the results from
a group of 29 PNs that have been spatially resolved, for the first time, in all
the major optical lines. Images in the light of \ha, \nii, and \oiii are
presented, together with line intensities, measured from the extracted 1D and
2D spectra. A study on the surface brightness in the different optical lines,
the electron densities, the ionized masses, the excitation classes, and the
extinction follows, illustrating an ideal consistence with the previous results
found by us on LMC PNs. In particular, we find the surface brightness decline
with the photometric radius to be the same in most emission lines. We find that
asymmetric PNs form a well defined cooling sequence in the excitation --
surface brightness plane, confirming their different origin, and larger
progenitor mass.
