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Fig. 2.
Montage of I-band spectra of classification standards for apparently single stars of spectral type O9-B2.5. The spectrum of the 3.18-day eclipsing binary Wd1-36 is included to indicate the appearance of SB2 systems of comparable spectral type within Wd1; note the shallow, flat-bottomed Paschen series lines (see Sect. 3.5).
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