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Fig. 12
Ratio τ(250 μm) /τ(J) in field G4.18+35.79 at a resolution of 120″, based on VISTA NIR data. Frame a) shows a map of τ(250 μm), frame b) a map of the ratio τ(250 μm) /τ(J). Frames c) and d) are estimated lower and upper limits of τ(250 μm) /τ(J) (cf. Fig. 10).
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