Ratio of the expected temperature from Eq. (6) over the mean group temperature as a function of distance from the group centre for COSMOS sources within 10r₂₀₀ and Δv/σ_disp < 2.7. We show the universal galaxy cluster temperature profile of Loken et al. (2002), given by T/T₀ = 1.3(1 + 1.5r/r₂₀₀)^−1.6. The dashed line shows the distance corresponding to the virial radius r₂₀₀ from the group centre. The IDs of some sources are annotated. The BA of the sources is given by a colour scale.