Fig. 7
F814W HST/ACS images. Example of the procedure to identify SF knots. Left: first isophotal analysis, where the principal objects in the image are defined. Middle: second isophotal analysis of the target galaxy, where substructures are found. Right: a zoom of the image in the middle. Regions with a radius bigger or equal to the PSF (0.09′′) will be identified as subregions or knots. For clarity the detected regions are shown with different colors.
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