Such images associated with spectroscopy, allow to understand the kinematical properties of these large structures, and therefore to study the mass distribution of the galaxies in these systems, especially at the low mass end, a key parameter for cosmological studies. Exposure time is 1 hour. The seeing was around 0.9 arcsec. The pixel scale is 0.2 arcsec. For the top mosaic an 8x8 pixel binning has been used.
North is up, East to the left.
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