Comparison of three (1999–2008) and five (1994–2009) epochs of Hα observations for Cyg OB2 #12 (upper panel) and ζ1 Sco (lower panel) demonstrating line profile variability at low projected velocities. Note the corresponding lack of variability in the line wings and the C iiλλ 6578, 6582 doublet in the red wing. Due to their lower resolution, spectra of Cyg OB2 #12 from 1992+5 are not presented, but are consistent to these spectra when all are convolved to a matching resolution.
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