Notes. Selected methanol lines used to perform our rotation diagrams (Fig. A.1). Possible contamination with other molecules is mentioned in the rightmost column. ✓ indicates well-distinguished/confidently-detected lines while the dash symbol (–) indicates a poor signal or non-detection. Certain methanol species that are highly improbable to blend with others are also identified: The 7₋₁→6₀ − E line falls within the range of frequencies of the 19₂→18₃ − E methanol line in all sources while the 7₀→6₀ − A⁺ methanol transition falls within the frequency range of the 7₆→6₆ − E methanol transition for the case of IRAS 16293 and CARMA 7, given the higher FWHM of the CH₃OH lines in these sources compared to the rest of the sample. Line frequencies and upper-level energies were taken from the CDMS database (Müller et al. 2005).