Integrated map of the CH₃CN J = 13–12 emission (K = 0, 1 projections) (center). Grayscale unit is Jy beam⁻¹ km s⁻¹. Blue contours represent the continuum emission at 334 GHz. Levels are at 15, 30, 50, 80, 140, and 200 mJy beam⁻¹. The beam is indicated in the top right corner. The spectra of the CH₃CN J = 13–12 emission toward C2 and C1 are presented in the left and right panels, respectively. The red curves in both spectra indicate the Gaussian fittings.