Overview of the OD ²Π_3∕2 ground-state(J = 5∕2−3∕2) transition towards the sample. The spectra are normalised to the continuum level and thus show the line-to-continuum ratio. The rest frequency is set to the strongest hyperfine transition, F=7/2⁻−5∕2⁺, at 1391494.70 MHz. The vertical blue dotted line marks the systemic LSR velocity of the source (Table 1), horizontal grey dotted line shows the intensity ratio of 1. The light blue line shows a single or a two-component Gaussian fit to the spectrum. The positions and the relative strength of the hyperfine components are shown in green. The red spectra correspond to the HDO (J_K,A = 1_1,1−0_0,0) line at 893.6GHz from Herschel/HIFI, the orange spectrum shows the same line observed with the APEX telescope. The source name is labelled in the lower right corner of each panel.