Main beam temperature versus velocity for the [O I] (black) GREAT HFA-band spectra for four lines of sight. The scale for [O I] is on the left and the scale for [C II] and [N II] is on the right. There is a 3.5-σ detection at G337.0+0.0, but only upper limits for the other three LOS. There is an emission gap in [O I] for G305.1+0.0 due to the presence of an atmospheric absorption line which has been removed. Superimposed on the [O I] spectra are the corresponding HIFI [C II] (blue) and [N II] (red) spectra (Langer et al. 2016).