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Fig. 13


Comparison of group masses as estimated in this work and by Tully (2015b). We have used only the virial theorem, while Tully (2015b) used the virial theorem (left panel) and galaxy luminosities (right panel). Here, only identical groups (blue points) and similar groups (red points) with at least four members are shown. The virial-theorem-based mass estimates agree well with each other.

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