Integrated H i line flux, FH I (in Jy km s-1), as a function of W50 line width (in km s-1). Black dots represent clear NIBLES detections and gray dots marginal detections, whereas green squares are high-quality (their Category 1) α.40 catalog ALFALFA detections (Haynes et al. 2011, from), and light blue ones their marginal (Category 2) detections. The ALFALFA galaxies shown cover the same velocity range as NIBLES, 900–12 000 km s-1. The red line indicates the expected line flux as a function of line width for a flat-topped 3σ H i profile and a 2 mJy rms noise level.
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