Fig. 4
Comparison of our morphological spectral types, based on the high-resolution spectra degraded to R = 4000, and those attributed by Walborn using low-resolution photographic spectra (Δλ = 1.2 A) for 14 stars in common. The X-scale corresponds to spectral types from O2 to B2. Stars considered/suspected to be SBs are marked with large circles.
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