Comparison between NIBLES and literature values for central H i line velocities, VH I, and W50 line widths. Only sources matched in H i velocity and in line width are plotted (see Sect. 4.6). Top panels: comparison with data from the α.40 ALFALFA catalog (Haynes et al. 2011); lower panels: comparison with HIPASS data ((Meyer et al. 2004; Wong et al. 2006). Left-hand panels: W50 line widths. Literature values as a function of NIBLES widths (in km s-1). The solid line marked with “1:1” indicates equality between both scales and was only added to guide the eye. Right-hand panels: central H i line velocity. Difference between VH I (in km s-1) measured at the NRT for NIBLES and literature values as a function of NIBLES line velocity (in km s-1). The horizontal lines indicates the mean velocity differences.
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