28SiO channel maps observed with a spectral resolution of ~0.5 km s−1. The clean beam of 3.8′′ × 2.8′′ is shown in the bottom left corner of the maps, and the primary beam of 56′′ is reported as a dashed black circle. The green contours in the channel maps show the 10, 60, and 120σ levels of the integrated intensity map of the 28SiO, as shown in Fig. 1. The central velocity of the channel is reported in the top left corner of each panel.
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