CH₃OH averaged spectrum obtained on 13.95 UT January 2005. The lower and upper x-axis scales represent the frequency of the lower and upper sidebands, respectively. Labels indicate detected CH₃OH spectral lines listed in Table 3. There is a blend of three A and A emission lines at 338.513 GHz (label 5). The observed line at 338.722 GHz is a blend of two E components (label 13). The A line at 341.416 GHz (label 14) is in the upper sideband close to the A transition at 338.409 GHz (label 3). A marginal detection of the E line at 338.530 GHz is indicated by label 6. The unidentified emission features labeled by (?) are discussed in Sect. 3.2.