Portion of the CH₃OD microwave spectrum dominated by the J = 7 ← 6 R-branch of transitions in the 317.2–318.0 GHz range. The observed spectrum is shown in the lower panel, and the calculated one is in the upper panel. The spectrum was recorded in the first derivative detection mode of the Kharkiv spectrometer. The K quantum numbers for the m = 0, 1 (υ_t = 0) transitions are given above, and for the m = −2, −3 (υ_t = 1) transitions, they are given below the simulated spectrum in the upper panel. We observed that the experimental frequencies and the intensity pattern are rather well reproduced by our model for the spectral features dominating this frequency range.