Normalised fluxes plotted with φ (shifted upwards) of two forbidden [N ii] (left-hand panels) and two [Fe ii] (right-hand panels) emission lines in MWC 314. The FWHM ≃ 50 km s-1 of the double-peaked [Fe ii] emission lines is comparable to the permitted Fe ii emission lines (see Fig. 16), indicating a common line formation region in a circumbinary disc. The [N ii] lines show smaller FWHM ≃ 25 km s-1.
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