Fig. B.1.

ℛ[OII] as a function of the [O II]λλ3726,3729 doublet effective wavelength λeff for an unresolved mock doublet of FWHM 3, 4 and 5 Å. In each panel the open circles refer to Gaussian fits from the line base, and filled circles refer to Gaussian fits from half peak intensity. The vertical dot-dashed lines mark the position of the individual component of the [O II] doublet.
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