Three forbidden oxygen [OI] lines in comet 46P, from ESPRESSO observations, at 557.73 nm (left) for the green line, and 630.03 nm (middle) and 636.38 nm (right) for the red doublet. The cometary oxygen lines are identified by tick marks and the telluric lines marked by dashed tick. The y-axis is in arbitrary units for all three panels. The red line is a fit for one of the six spectra taken in the centered fiber.