Correction of the [OI]λ6300 line profiles for contamination by telluric emission and absorption lines (left panels) and photospheric absorption lines (right panels) for all stars where emission was detected in [OI]λ6300. Left panels: the original spectra are plotted in black, while the blue shows the spectrum after corrections for telluric emission and absorption, as well as the removal of cosmic rays. Right panels: the spectrum after telluric corrections is shown in black, while red represents the photospheric template that was used (including veiling and rotational broadening). The final, residual profile is shown in blue, shifted in the vertical axis for better viewing. Notes. Profiles marked with an asterisk on the top right corner of the right panel are those that were observed more than once. In these cases, telluric corrections were applied for each night individually, then the mean spectrum was taken in order to increase the S/N. This mean spectrum (shown in black on the right panels) was then corrected for the photospheric contribution and the residual profile was recovered. For these stars, the left panel shows the telluric corrections of one night. Some stars did not present photospheric features in the region close to the [OI]λ6300 line, either due to their effective temperature (the B-type star CSIMon-000392) or to insufficient S/N in the photospheric lines (CSIMon-000423, CSIMon-000632, and CSIMon-001011). For these stars, we fitted the continuum and subtracted it to recover the residual profile. The star CSIMon-000631 is an A-type star for which a good template was not found since few hot stars were included in our observations. We used as its photospheric template an F-type star with a similar absorption feature close to the [OI]λ6300 line in order to remove this feature, ignoring the rest of the spectrum. This is why the absorption line close to 6320Å is not well fitted. The star CSIMon-001234 is a spectroscopic binary, therefore it was fitted with a combination of two photospheric templates.