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Fig. C.1.

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GRB hosts images from WFC3/F160W observations (left), their best GALFIT models (middle) and the residual maps (right). Images are centered on the best positions of the host galaxies determined by GALFIT and corresponds to a square region of 9 arcsec, where north is up and east is to the left. The red marks emphasize the objects considered as the GRB host galaxies. The black regions are the objects masked during the fitting processes based on the SExtractor segmentation map. The fraction of pixels with a residual greater than three times their noise within 2 × Re of the target object is visible in the lower part of the residual map.

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