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We report a non-detection of the [OI] 63-um emission line from the z = 6.03galaxy G09.83808 using ALMA Band 9 observations, refuting the previouslyclaimed detection with APEX by (Rybak et al. 2020); the new upper limit on the[OI] 63-um flux is almost 20-times lower. [OI] 63-um line could be a powerfultracer of neutral gas in the Epoch of Reionisation: yet our null result showsthat detecting [OI] 63-um from z$\geq$6 galaxies is more challenging thanpreviously hypothesised.

Bright beacons? ALMA non-detection of a supposedly bright [OI] 63-um line in a redshift-6 dusty galaxy