Fig. 1
Colour image (240″ × 184″) of MACS J0717 based on HST images in the F435W, F606W, and F814W ACS pass bands. Multiple-image systems used in this work are marked: in red, the 48 multiple images identified prior to the HFF observations; in blue, the 84 images discovered thanks to the HFF observations; in cyan, the 33 candidate images discovered in the HFF observations. Shown in white is the critical line for a source redshift of 7.
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