Fig. 5
N2H+ abundance ratio over the color index between 160 μm and 250 μm. Marked by green dots are pixels that lie within IRDCs. Overplotted with red ×s are all mapped PACS sources. Blue crosses also have a 24 μm detection, while the light blue dots represent source that are saturated at 24 μm. The uncertainties given for IRDC 18223 are representative for all regions.
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