Line of sight velocity dispersion in 574 clusters and rich groups of galaxies as a function of the apparent elongation q2D. The blue error bars show the mean 68 per cent uncertainties of the measurements. The black points show the mean and the 68 per cent scatter of the dispersions in 5 bins of the elongation. The velocity dispersions are scaled by the characteristic velocity Vc which is a measure of the gravitational potential depth of the host dark matter haloes. The figure shows that circular clusters exhibit higher normalised line of sight velocity dispersions than elongated ones.
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