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   61058
   In the low state of Cyg X-3, it shows the brightest iron emission line
   in the sky. ASCA, however, has not yet observed the low state of Cyg X-
   3. Cyg X-3 was observed with ASCA two times in its high state. ASCA
   found many emission lines form various elements and emission-line-like
   feature produced by free-bound transition for S XVI. This was the first
   direct evidence of the photo-ionized plasma in the universe. The plasma
   condition should be influenced by the luminosity and the energy
   spectrum of the central source. The observation of the low state of Cyg
   X-3 will provide various surprising feature that we have never seen.
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