Spectral index β vs. colour temperature T for the clump samples of Fig. 4a–c (left frame) and Fig. 4d–f (right frame). The black symbols correspond to fits to the original SPIRE data, and the blue symbols to the combination of SCUBA-2 and filtered SPIRE data. Only clumps from the P(χ2 )=25% samples are included. The median values are indicated with large crosses. Frame a includes a contour for a typical 67% confidence region in the four-band fits.
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