Temperature (a) and spectral index (b) histograms for the entire fields, computed with SED fits of the 250–500 μm (hatched histogram) and 160–500 μm (purple histograms) data. Only areas covered by both PACS and SPIRE observations are used. As the MBB script fits temperatures between 5–40 K, and spectral index between 0.6 and 3.5, thus the first and last bins include all pixels with T or β outside of these ranges.