Comparison between peak-normalized distributions of rms noise level values below 5 mJy: NIBLES (at 18 km s-1 velocity resolution), all observations (black line, N = 2606), clear detections (blue line, N = 1727), marginal detections (yellow line, N = 176) and non-detections (red line, N = 703), and (dark gray line) all 15 598 ALFALFA α.40 catalog detections, at 10 km s-1 velocity resolution (Haynes et al. 2011).
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