This article has an erratum: [https://doi.org/10.1051/0004-6361/201014703e]
The velocity dispersions of the galaxy sample. Top: the measured galaxy velocity dispersions as a function of redshift in clusters (left) and the field (right). The green lines show the mean values in 0.1 redshift bins and the relative errors. The dotted lines show the mean values weighting each galaxy with the inverse of its completeness value. Bottom: the histogram of galaxy velocity dispersions in clusters (left) and the field (right). Colors code the spectral type (black: 1; red:2). The dotted lines show the histogram for the entire sample irrespective of spectral type.
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