Differential velocity distribution of the zspec members of PCl J1001+0220. The median redshift of zspec member galaxies is shown in the top right corner of the plot. Also shown in the top right corner is the value of the best-fit line of sight (LOS) velocity dispersion (σv, see Sect. 3 for details). The resulting Gaussian function generated by the best-fit σv is overplotted on the differential velocity histogram (solid black line) along with those functions generated from .
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