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Fig. 5

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Corrected (g − i)o color of galaxies of all morphological types as a function of the local galaxy density (top panel) and of the projected angular separation from M 87 (bottom panel). HI-rich LTGs are depicted with blue symbols; HI-poor LTGs are plotted with cyan symbols; LTGs undetected by ALFALFA are given with green symbols; ETGs are marked with red symbols.

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