A search for the favored hyperfine transition of a 6.7 GHz methanol maser line

Open Access

Fig. B.1

The total intensity (I) spectra of the 6.7 GHz CH₃OH (upper panel) and 6.035 GHz ex-OH (middle panel) maser emissions, and the left- and right-hand circular polarization (LHCP, RHCP) spectra (bottom panel) of the ex-OH maser emission detected toward G69.540-0.976 (ON 1). The systemic velocity of the region is $V_{L S R, sys}^{O N 1} = + 11.6 {k m s}^{- 1}$ $V_{\mathrm{LSR}, \text {sys}}^{\mathrm{ON} 1}= +11.6 \mathrm{kms}^{-1}$ (Bronfman et al. 1996).

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