Fig. 6
Fit of τ(250 μm) = A + B × τ(J) + C × τ(J)2 to the combined data of all fields in which individual linear fits showed a strong correlation with δk/k< 0.2. The blue and the green lines correspond to fits to the full column density range and to data points τ(J) > 1.0 alone, respectively. In the second frame, only data with colour temperatures below 14 K are used.
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