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   63027
   We propose ASCA observations of the three bright ultrasoft narrow-line
   Seyfert 1 galaxies Mrk 142, MS 2340-15 and RX J 2217-59. We will
   measure their soft and hard X-ray continua, their spectral features,
   and their flux and spectral variability. ASCA spectra will allow (1)
   precision fitting of the soft X-ray excess and hard X-ray power law,
   (2) studies of broad and ionized iron K line emission, (3) studies of
   ionized gas along the line of sight, and (4) measurements of the
   Compton reflection continuum. ASCA light curves will allow (1) studies
   of rapid and nonlinear X-ray variability, (2) power spectrum analyses,
   (3) measurements of spectral variability.
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