We present a systematic analysis of the X-ray spectral properties of a samp
le of 22 'narrow-line' Seyfert 1 galaxies for which data are available from
the ASCA public archive. We also consider the spectrum of the bright NLS1
Ark 564 in detail using simultaneous ASCA and RXTE data. (C) 2000 Published
by Elsevier Science B.V. All rights reserved.