Fig.7

Distribution of spectral indices (for the sources present in the ERCSC at a given
frequency in our sample with completeness of 80% or above). Here
is shown as a dotted line,
as a dashed line, and
as a solid line. The region
2 ≤ α ≤ 4 is typical of thermal dust emission. In red we show the
dusty sources, whereas in blue we show the synchrotron sources. The sources in all
three samples (deep, medium, and shallow) are combined here. Note that, as expected,
the 100 GHz, and 143 GHz samples are dominated by radio galaxies, whereas the
545 GHz and 857 GHz samples are dominated by dusty galaxies. At 217 GHz and 353 GHz
we observe the transition between the two populations, with significant numbers of
both types being present in the samples.
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