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Fig. 1.


Top panels: large-scale, three-color view of the IRDCs G11.11−0.12 (left panel) and G28.34+0.06 (right panel) obtained with Spitzer IRAC and MIPS data with 3.6 μm (blue), 8.0 μm (green), 24.0 μm (red) from the GLIMPSE and MIPSGAL survey (Churchwell et al. 2009; Carey et al. 2009). Bottom panels: Herschel PACS 70 μm emission towards our targets G10.99−0.08 (left panel) and G28.33+0.07 (right panel; Molinari et al. 2016). The contour levels correspond to ATLASGAL 870 μm emission (0.1–1.3 in steps of 0.1 mJy beam−1; Schuller et al. 2009). The starless core regions mapped with the SMA are shown as circles.

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