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Fig. 1


The 12CH3OH and 13CH3OH spectra towards W51 e1/e2. For both isotopologues the velocity has been set to zero at the frequency of the lowest energy line (see Table 1), and the upper and lower sets of vertical lines mark the expected line velocities for 12CH3OH and 13CH3OH, respectively. The dashed box marks the velocity interval over which the intensities, presented in Table 3, have been integrated. Note that the intensity of the 13CH3OH spectrum has been scaled up by a factor of 10.

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