Planck early results
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Fig.3

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60μm to 857GHz (i.e., 350μm) colour plotted against the cirrus RMS at 100μm in IRAS. ERCSC sources classified as point-like are shown as open diamonds, while extended sources are shown as solid dots. Note that the extended sources show a clear correlation between colour and cirrus RMS, indicating that these sources are likely to be contaminated by cirrus emission.

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