Fig. 2
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Images of NGC 4361 in Hβ, He I 5876 Å and He II 5412 Å with linear colour table lookup (see the colour bar right of each figure). The two coloured wedges at the SE and NW corners of the field shown on the Hβ image represent the regions used for sky background estimation. The contour map on the images is derived from the Hβ image.
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