Fig. 5
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Profiles of SiO ground-state and first vibrationally excited state lines. Left: SiO(6–5): upper: v = 1, lower: v = 0. A-configuration and D-configuration merged. Right: SiO(5–4): upper: v = 1, D-configuration (black) and A-configuration (red), lower: v = 0, A-configuration and D-configuration merged. The spectral resolution is 1 km s−1 for (v = 1) and 0.5 km s−1 for the (v = 0) lines, respectively. The emission is integrated over the central 5′′ × 5′′ aperture.
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