Comparison of (T, β) relations in observations and in simulations with a constant value of β = 1.7. The observations consist of the same IRAS and Planck data as in Fig. 1 and represent the average emission of the fields. Left and right frames show results for 100–550 μm and 100–1380 μm fits, respectively. In the upper frames, black symbols show the real observations, and green crosses show one realisation of simulations with k (noise) equal to 0.4 (left frame) and 1.0 (right frame). The black lines are fits β = A × TB to the observations (solid line) and to the green crosses (dashed line). The lower frames show the change in the rms value of the residuals of the β(T) fit (solid blue lines, left axis) and the value of B (dashed red lines and right axis) as a function of k (noise). The horizontal lines correspond to the values in the actual observations.
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