Integrated Hi line flux F_HI (in Jy km s^-1) as a function of W₅₀ line width (in km s^-1). Shown are the NIBLES non-confused and non-resolved detections and marginals from both our Arecibo and Nançay observations, together with the ALFALFA data from the α.40 catalog (Haynes et al. 2011), where green dots represent detections (their Category 1) and light blue dots represent marginals (Category 2). The red line indicates the integrated line flux from a 3σ flat-topped profile with a 0.57 mJy rms noise level.