Fig. 10
Three forbidden oxygen [OI] lines in comet C/2016 R2 at 557.73 nm (left panel) for the green line, and 630.03 nm (middel panel), and 636.38 nm (right panel) for the red doublet. The cometary oxygen lines are identified by red tick marks, while the dashed blue tick marks indicate the corresponding telluric lines. The y-axis is in arbitrary units.
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