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Fig. 1.

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Rest frame J−1 → (J − 1)0 − E methanol J = 7 and 10 transition spectra of our subsample (Sect. 2.1, solid black lines), along with the rotation diagram best fits (dashed blue lines, see Fig. B.1). The Local Standard of Rest velocities (VLSR; labeled in orange) of the different sources were obtained from the literature where we assume a common uncertainty of 1.0 km s−1 (see Sect. 2.3).

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