Fig. 8.
Wavelength coverage of the rest-UV CIV and HeII lines, redshifted to z = 6.591. We note that the background in a larger region around λ0, z = 6.591 = 1560 − 1565 Å is boosted due to low atmospheric transmission and faint skylines. CIV and HeII lines are not significantly detected in COLA1, implying EW0, CIV < 25 Å and EW0, HeII < 12 Å.
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