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Fig. A.1
Column density of SiO (left) and H13CO+ (right) calculated at T = 40 K. The contour levels of the SiO image are 15(30)60 × 1012 cm-2 and for the H13CO+ image 13(13)40 × 1012 cm-2. The lowest contour in both cases shows the 5σ level.
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