Fig. 6
Cumulative distribution of the ratio of total Hα flux in the imaging material to the Hα flux measured in a central aperture of 10, 15, 30 or 45 arcsec diameter for galaxies of major axis 0–100, 100–200, 200–300 and >300 arcsec. The blue histogram refers to LTG-in ALFALFA with DefHI ≤ 0.3 and the red one includes LTGs with DefHI > 0.9 and LTGs undetected by ALFALFA.
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