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Fig. 1.
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High contrast composite image of IZw18 using HST ACS R, I, and V bands, shown in the red, green, and blue channels, respectively. Isocontours delineate the central knots (adapted from Papaderos & Östlin 2012). The three LCB pointings are shown. North is up, and east is to the left here and in all subsequent figures.
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