Residuals of the fit for the mass determination of groups with only one visible member depending on the fitting parameter. Top-left panel: residuals as a function of the total Ks band group luminosity for the 2MRS data. The top-right panel: residuals as a function of the luminosity distance for the 2MRS data. Bottom-left panel: residuals as a function of the total r band group luminosity for the SDSS data. The Bottom-right panel: residuals as a function of the luminosity distance for the SDSS data.
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