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Fig. 3


Top: colour ratio versus dispersion of the 353 GHz template for each sky patch. The 1σ dispersion of the values is shown as the shaded grey area. The mean ratio corresponds to a spectral index of 1.51 (solid line) for a mean Td = 19.6 K. Bottom: probability distribution function (PDF) of the values derived from using the specific value of Td for each sky patch. The measured 1σ dispersion of is 0.07.

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