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Fig. 5
[O iii] 5007 (left and middle) and Hα+[N ii] (right) mosaic images of Ou4. The sharpness of the [O iii] 5007 image was enhanced in the middle panel using a blurred mask. The colour scale is logarithmic in the left and right panels. The field of view in each panel is 
. North is up, east is left.
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