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Fig. 8

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Relationship between the ratio of the central beam to total extrapolated CO flux ratio (aperture correction) as a function of the filling factor ff, defined as the fraction of the galaxy covered by the central beam for all the HRS galaxies with available single-beam observations (lower panel). Red symbols are for those galaxies observed in this work, blue symbols for other objects observed by our team in previous surveys, while the remaining black circles those with data available in the literature. The upper panel shows the distribution in the filling factor for all the HRS galaxis observed in CO. The blue histogram gives the distribution of all galaxies observed by our team, including previous data (Boselli et al. 1995, 2002; Sauty et al. 2003), while the red one only those observed in this work.

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