All Figures

	Figure 1: Examples of emission line profiles of He II 1640 Å  C IV 1548 Å and O III] 1666 Å in CI Cyg. The numbers on the right side refer to the number of the spectrum and orbital phase, respectively.
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In the text

Figure 2: Radial velocity curves for CI Cyg. The dashed line repeats the orbit of the M giant and the dotted line - the circular orbit solution for the He II 1640 Å emission line, respectively. The solid line corresponds to the elliptical orbit solution for the intercombination line (see text for details). Open and closed symbols correspond to the late decline (1979-82) and quiescent data (after 1983), respectively.

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In the text

	Figure 3: The smoothened and normalized He II 1640 (solid line), average C IV profiles (dotted line) and Mg II (dashed line) profiles, observed with the HST/GHRS. The He II profile was increased by a factor of about 2, in order to fit the red wing to the C IV and Mg II profiles.
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In the text

	Figure 4: Variation of line fluxes for N V 1240, He II 1640 and O III] 1664 emission lines. The open and filled circles correspond to the data from the high and low resolution IUE spectra, respectively.
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In the text