Correction of the [OI]λ6300 spectra shown for Sz 98 in slit position 3 as an example for all targets. Black: the 1D spectrum after the reduction with the ESOREFLEX/UVES workflow. Orange: the 1D spectrum after the telluric correction. The narrow telluric absorption features have been mitigated. The remaining absorption features are due to the stellar photosphere. Green: the 1D spectrum after the pho-tospheric correction. The broad photospheric absorption features have been removed and the flux is normalised to the continuum.