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Fig. 8

image

Residuals of the fit for the mass determination of groups using 2MRS and SDSS mock data. Top-left panel: residuals of our fit using isolated galaxies (groups with one visible member only) for the 2MRS data. Top-central panel: residuals of groups with two to four members using 2MRS data. Top-right panel: residuals of groups with five or more members using 2MRS data. Bottom-left panel: residuals of our fit using isolated galaxies (groups with one visible member only) for the SDSS data. Bottom-central panel: residuals of groups with two to four members using SDSS data. Bottom-right panel: residuals of groups with five or more members using SDSS data.

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