Full HST mosaic, covering the entire field of MACS J0717 and its extended filament. The blue ellipse corresponds to region B, the cosmic filament area closest to the cluster. The green ellipse corresponds to region C, the cosmic filament area southeast of the cluster and located further. The red and yellow circles are of 1 Mpc and 807 kpc in radius, respectively, centered on the core of MACSJ 0717. The cyan and magenta contours show 3σ weak lensing contours from Martinet et al. (2016). The cyan rectangle is the HFF FoV in the optical filters; see Fig. 1 for a zoom on this area.
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