Detail of the APEX line survey towards the hot core G327.3-0.6. The observed spectrum is depicted in black, and the model for ¹²CH₃O¹³CH₃ is overplotted in red. The general model including transitions of all previously identified molecules is given in blue. The spectroscopic assignment of transitions of DME-¹³C₁ is given in the upper left of each individual panel. The asymmetry splitting and the torsional splitting of transitions is not resolved in these lines, except for the first panel, in which the torsional splitting into three components is indicated.