Fig. 2
HI mass function for the 623 HI selected galaxies collected from ALFALFA in the range 3900 <cz< 9000 (km s-1) (black solid histogram). It is indistinguishable from the red solid histogram, which refers to the galaxies subject to Hα follow up observations. HI mass function of Martin et al. (2010) (black solid line). There is a lack of bright galaxies above 1010.5M⊙ because of the finite sampled volume of the Coma supercluster.
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