Example of fits of the [Oii] doublets by a double Gaussian on some spectra from plate 8130. Each spectrum (blue error bars) is labeled by its fiber number and the fits (black solid) are characterized by the χ²/d.o.f. given above each panel. We show the two individual Gaussians as red dashes. The vertical magenta dashed lines are at (1 + z)λ_[OII]. The panels are ordered by increasing value of X. Around a value of X = 7, the blended doublet starts to be a better model than a single Gaussian. The last panel shows the [Oii] S/N vs. X with horizontal and vertical solid lines at a value of 7. X is the S/N with which the two components of the doublets are detected.