Moment maps of the SO N_J = 5₆−4₅ line at 219.949 GHz, same as Fig. 2. Contour levels are 2, 4, 8, and 16 times the rms noise level of 5.02 mJy beam ⁻¹ for the maximum intensity (moment 8; left and middle panels) and 2, 4, 8, 16, and 32 times the rms noise level of 17.10 mJy beam⁻¹ km s⁻¹ for the integrated intensity map (moment 0; right panel). We note that the velocity range shown in the color scale is narrower than those of SiO (Fig. 2).