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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