The notable surface brightness features discussed in the text are marked on an extract of the SOFI Ks image. The position of the semi-stellar source is marked in the centre of the bright nebulosity (white in the figure) surrounding it. The YSO_SE filament is shown with a line in the insert. The contours in the insert delineate the central source. The continuous curve marks the ring-segment-like structure facing the NX Pup and the dashed curves the brightest filaments emanating from the YSO. The faint surface brightness patch is inside the circle in the right.
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