Same as Fig. 1 but for L1689B. The column density contours are 6 × 1021, 1 × 1022, 1.4 × 1022, 1.8 × 1022, and 2.6 × 1022 H2 cm-2 (left), and the temperature contours are 16.5, 15.5, 14.5, and 13.5 K (right). The column density image shows that L1689B is embedded inside a filamentary structure.
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