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Fig. 7


Peak value of a Gaussian fit for the absorption depth ToffTon for different methods of estimating Toff. Top and middle panels: method using a polynomial fits with second and forth order, respectively. Bottom panel: method using a spatially averaged off spectrum shown in Fig. 5. The white contours represent the integrated 13CO emission at levels of 5 K km s−1 for reference. The circles from left to right marked the same positions as in Fig. 1 where Spectra 1 to 5 shown in Fig. 6 are extracted, respectively.

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