a) October 2008 spectrum at 22 GHz of candidate Hα emission-line star Ha7. The spectrum is smoothed to a resolution of 0.53 km s^-1. b) As a), but smoothed to a resolution of 1.05 km s^-1. c) As a), but for the May 2009 spectrum. d) As b), but for the May 2009 spectrum. e) Average spectrum at 22 GHz of the 2008 and 2009 observations of Ha7, smoothed to a resolution of 0.53 km s^-1. f) As e), but smoothed to a resolution of 1.05 km s^-1.