Spatially resolved spectra of four SiO lines detected in our ALMA observations. (a) Continuum-subtracted intensity map of the Si ¹⁷O line (v = 0, J = 6–5) integrated from V_rel = −10 to 10 km s⁻¹. The crosses and numbers represent the positions where the spatially resolved spectra shown in panels b–p were derived. (b–f) Spatially resolved spectra observed at five positions over the stellar disk. The black, red, green, and blue lines represent the spectra of the ²⁹SiO v = 3 J = 6–5, ³⁰SiO v = 2 J = 6–5, ³⁰SiO v = 1 J = 6–5, and Si¹⁷O v = 0 J = 6–5 lines, respectively. The spectra were obtained from the data cube with the continuum emission. (g–k) SiO spectra obtained at positions 5–8 at a radial distance of 50 mas from the stellar disk center. These spectra were extracted from the continuum-subtracted data cube. The spectra measured at the disk center are shown in panel g to facilitate comparison between the absorption and emission spectra. (l–p) SiO spectra obtained at positions 9–12 at a radial distance of 90 mas from the stellar disk center, shown in the same manner as in panels g–k.