Fig. 1
Sky distribution (RA and Dec not to scale) of 623 HI selected galaxies in the ALFALFA strip 24°< Dec < 28°; 3900 <cz< 9000 (km s-1) (from Haynes et al. 2011), divided among 603 galaxies subject to Hα follow up observations (blue circles) and 20 not observed (red circles). Green circles indicate 121 optically selected galaxies from SDSS without AGC designation. The large semi-circle gives the position of the Coma cluster.
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