Spectra at positions N1S and N1S5 of the transitions of C₂H₅OH (black) and CH₃OH (maroon) that were used to create maps of peak velocity and line width, which are shown in Fig. B.2. The rest frequency and upper level energy of the transition are indicated with the respective molecule and in the respective colour in the upper left corner. The grey dashed line indicates the peak velocities (62.3 km s⁻¹ at N1S and 59 km s⁻¹ at N1S5).