Planck early results
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Fig. 21

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Temperature vs emission cross-section at 1200GHz (250μm) estimated from modified black-body fit with β = 1.8 to data from 353 to 3000GHz. Black is for LVCs, blue IVCs: IV Arch (dot), IV/LLIV Arch (triangle), Complex K (square) and PP Arch (star). The solid line respresents a constant emitted luminosity L corresponding to the diffuse ISM reference values (σe = 1 × 10-25cm-2 and T = 17.9K – dotted lines).

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