Completeness effects on the HIMFs obtained by assuming the linear (yellow stars) and the polynomial (blue squares) models for the M_HI − M_⋆ relation. The vertical dashed and dotted gray lines stand for the conservative completeness limits log₁₀(M_HI/M_⊙) = 9.2 and log₁₀(M_HI/M_⊙) = 9.4 for the polynomial and linear cases, respectively, and represent the lower limits used for the fit of the Schechter models to the data. We show the best-fitting Schechter models obtained by adopting the fitting strategy outlined above as solid yellow (linear model) and solid blue (polynomial model). We also display the HIMF from ALFALFA at z ∼ 0 (dashed green) for comparison.