Fig. 4.
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HII region selection. Left panel: HII regions selected using our segregation programme on the Hα observed emission line map. Right panel: HII regions selected with our segregation programme with the HeI λ 7768 Å observed emission line map, in logarithmic colour scale. Orientation is north up, east to the left. The physical scale is represented in the bottom left corner of the map. The outer and inner rings are marked with blue ellipses.
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