28SiO (2–1) opticaldepth map computed from the 28SiO/30SiO ratio assuming the solar isotopic ratio [28Si/30Si] = 29.8. The contours show the 10, 60, and 120σ levels of the integrated intensity map of the 28SiO, shown in Fig. 1. The primary beam of 56′′ is reported as a dotted black circle.
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