Planck 2013 results
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Fig. 5

image

Correlation plots used to estimate the Galactic zero levels of the IRAS and Planck maps (ZE subtracted). Left: correlation of 857 and 3000 GHz vs. H i column density obtained on the NH i< 2 × 1020 cm-2 mask (Fig. 3bottom left). Right: correlation of 353 and 545 GHz vs. 857 GHz obtained on the NH i< 3 × 1020 cm-2 mask (Fig. 3bottom right). All maps in the analysis were smoothed to a common resolution of 1°. The black circles and the associated bars are the average and standard deviation of Iν in bins of NH i (left) and I857 (right).

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