Fig. B.1
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Optical depth of the 13CO J = 6−5 and J = 2−1 transitions and the C18O J = 2−1 transition for LkCal5 (left) and HD 169142 (right). The optical depth of the J = 2−1 transitions is derived from their respective line ratio, and the optical depth of the 13CO J = 6−5 transition is derived using the line ratio analysis (see text for details).
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