Total Hi mass, M_HI (in M_⊙), as a function of Hi radial velocity (in km s^-1). Shown are the NIBLES detections and marginals from both our Arecibo and Nançay observations (black stars and dots respectively), together with data based on the ALFALFA α.40 catalog (Haynes et al. 2011), where green dots represent detections (their Category 1) and light blue dots represent marginals (Category 2). Excluded were all NIBLES detections which are definitely or probably confused by another galaxy within the telescope beam, as well as detections that are likely resolved (see Paper I). The Hi masses of the ALFALFA detections were calculated in the same way as for the NIBLES sources, using simply a distance of D = V/H₀, where the adopted Hubble constant is H₀ = 70 km s^-1 Mpc^-1. The green vertical arrow above the legend indicates the difference of 0.16 in log(M_HI) corresponding to the mean Hi flux scale difference between the α.40 catalog and our NRT data.