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Fig. 7

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V − I map of the central 156  ×  156 of I Zw 18, displayed in the color range between –0.5 and 0.15 mag. The contours are computed from the R′ image by P02 (see also Fig. 8) and go from 19 to 25 mag/◻″ in steps of 0.5 mag. Note the very blue (<–0.5 mag) rim encompassing the SF region NW.

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