(a) Observed 22 GHz H₂O maser (black) and ¹³CO (1–0) (blue)spectra toward the position M1. (b) Similar to a, but for the position M2. In panels a and b, the red lines represent the 22 GHz H₂O maser lines,which are scaled by a factor of eight in order to better visualize weak velocity components. (c) 22 GHz H₂ O maser integrated intensity contours (black) overlaid on the WISE 22 μm image. The integrated velocity range is from −18 to −14 km s⁻¹. The black contours start at 2 Jy km s⁻¹ and increase by 2 Jy km s⁻¹. The blue dashed contours represent the ¹²CO (3–2) integrated intensities which start at 2.4 K km s⁻¹ (3σ) and increase by 2.4 K km s⁻¹. (d) 22 GHz H₂O maser integrated intensity contours overlaid on the WISE 22 μm image. The integrated velocity range is from −2 to −0 km s⁻¹. The contours start from 0.1 Jy km s⁻¹ and increase by 0.1 Jy km s⁻¹. In panels c and d, the beam size is shown in the lower left corner of each panel.