The observed temperature dependence of the spectral index in the three fields. The values are shown for individual pixels (green dots). For three selected pixels, the black contours show the limit at which the χ2 value of the SED fit has doubled from its minimum value. For the same pixels the smaller symbols (joined with solid lines) show the extreme values allowed by the calibration uncertainty (see text). The error regions for these extreme cases are drawn with dashed and dash-dot lines.
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