Fig. A.1
Panels a and b: average spectra extracted from parallelograms 1 and 2, respectively, shown in Fig. 3. The spectra are affected by standing waves, with a period around 200 km s−1, which originate from the local oscillator feed horns of HIFI (see Sect. 3). Panel a illustrates a sine function, highlighting the shape of the standing wave.
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