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Fig. 4

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a) Column density profile of L1689B obtained at 500 μm resolution by applying the Abel reconstruction method to the circularly averaged intensity profiles between 160 μm and 500 μm (solid black curve). The dash-dotted blue and green profiles show the column density profiles obtained from reconstructing the intensity profiles observed along EW and NS sectors, respectively. The overplotted solid red line shows the best-fit Bonnor-Ebert model (see Table 2 for parameters). The vertical dotted line is same as in Fig. 2. b) Reconstructed dust temperature profile of L1689B (solid curve) compared with the LOS-averaged temperature profile derived from simple SED fitting (thick dashed curve).

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