Fig. 16
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Variation of |τ4.8| in the 
–Tk plane, with the SED of the dust emission given by Eq. (2), with p = 1.15 and Td = 100 K and when the H2CO abundance is restricted to be less than 10−5. The upper panel is for W = 0.3 and the lower panel for W = 1. This result should be compared with that shown in Fig. 9 where no upper limit is placed on the H2CO abundance.
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