Optical line spectra of ET Cha. All line profiles are continuum subtracted and normalised to line peak emission  =  1. The forbidden oxygen line [OI] 6300 Å is the strongest emission line by a factor 5 or more, see Table 4, hence the increased noise level in the other lines. The dip in the [OI] 6300 Å line coincides with the position of the telluric component which has been carefully removed, see text. The LiI 6708 Å absorption line has been used to determine the stellar velocity.