Results of 216 GHz observations towards NGC 1266. (a) The velocity-integrated lineemission maps of 2_2, 0 − 2_1, 1. Black contours: −70 km s⁻¹ to 70 km s⁻¹ (3, 6, and 9σ, where σ_core = 1.08 × 10⁻² Jy beam⁻¹ km s⁻¹). The lines and symbol conventions are the same as in Fig. 7. (b) The continuum emission at 216 GHz is shown in greyscale and via contours (3, 9, and 27σ, where σ_cont = 1.2 × 10⁻⁴ Jy beam⁻¹). (c) Spectrum in the unit of the flux density within the emitting region (over 3σ in moment-0 image) against the line-velocity offset at the systemic velocity. The black histogram shows the observation result. The red dotted line indicates the 1σ rms level. The black solid line signals the Gaussian fit. (d) Spectrum in units of the mean brightness at the peak intensity pixel against the line velocity.