Fig. 1.
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Detection significance of the [O II] line equivalent width, EW(OII)/σEW, as a function of EW(OII). The orange crosses show all the Wall galaxies, while the blue dots are those identified as ELGs. The horizontal dashed line marks the limit for a 2σ detection, while the vertical dashed line marks the position of EW(OII) = 3 Å.
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