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This article has 2 errata:
[https://doi.org/10.1051/0004-6361/201527565]
[https://doi.org/10.1051/0004-6361/201423481e]
Fig. 6
Upper panel: 4.5 μm extinction map. Lower panel: corresponding uncertainty map, including statistical and systematic uncertainties. The unit of the colour bar is in magnitudes. These maps are made available in electronic form at the CDS.
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