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   71109
   Two long observations of the Seyfert 1 galaxy MCG-6-30-15 were already
   performed with ASCA. The spectrum clearly shows a broad and skewed
   feature around 5-6 keV and it is well reproduced by a so-called "disk
   line". However, a recent analysis has shown that it can be reproduced
   also by introducing an absorption edge at 3.5 keV (S XVI K-edge) in
   addition to a line at 6.4 keV. Furthermore, if we approximate the broad
   and skewed feature by two broad lines at 5.5 keV and 6.4 keV, the time
   variations of the two line fluxes seem to be independent of each other,
   suggesting that they might have different origins. However, the
   statistics are still insufficient to conclude it and hence we propose a
   reobservation of this source for 400 ks in order to see the real origin
   of the 5-6 keV feature.
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