  The first results from a systematic study of warm absorbers in NLS1s using
BeppoSAX public archive data are presented here. We confirm ASCA results
showing that a warm absorber, as modeled by two oxygen K-shell absorption
edges, is less frequent in NLS1s than in broad line (BL) Sy1s (about 20 per
cent versus about 50 per cent). However, our study suggests that the ionization
state of NLS1s is not lower than that of BLS1s, as opposed to the ASCA-based
results. The soft excess temperatures of our sample, when fitted with blackbody
emission models, lie within a small range of values (about 0.02-0.15 keV in the
rest frame) with no marked dependence on source luminosity. This is in
agreement with ASCA-based findings for NLS1s and early results from IUE-ROSAT
BL Sy1 observations.
