Upper panel: year-averaged radial velocities of the blue peak. Full squares: the Hα data from Gezari et al. (2007) year-averaged to match our data; full circles: the Hα given in Newman et al. (1997) year-averaged to match our data; full triangles: our data for Hα. Bottom panel: month-averaged radial velocities of the blue- and red-peak positions for Hα and Hβ.
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