Luminosity functions of the CALIFA mother sample (MS), the observed sample, the useful sample (see text), and the final Tully-Fisher sample defined in Sect. 5.2. The dotted lines denote the MS completeness limits calculated in W14. SDSS DR7 Petrosian r-band magnitudes were used for comparison with the SDSS luminosity function. The effects of outlier rejection steps are evident, especially for the more numerous low-luminosity galaxies with higher 1 /V_max weights.