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Fig. 4.
Wavelengths for which [OIII] and Hα would be observed if COLA1 is at z = 1.475. The dashed lines indicate the minimum expected [OIII] and Hα fluxes based on known extreme line-ratios ([OIII]/[OII]=0.1 and [OII]/Hα = 0.2, shown with FWHM = 200 km s−1). These line-ratios are ruled out at ≈1σ and 4.7σ, respectively.
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