Fig. 3.
Line profiles on a wavelength scale corrected for the adopted −179 km s−1 systemic velocity of M 33. Left: N III 4634-41 and He ii 4686 emission lines. We note the possible contribution of C IV. Right: N IV 4058 and the 4100 Å blend that includes Si IV, N III, and H I lines. Vertical lines indicate the laboratory wavelength of the transitions.
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