Fig. 2
Radio colour-colour plot for sources in the L45NW sample. Triangles represent sources that are not detected in NVSS. Sources that have been selected using the spectral curvature criterion described in Sect. 3.2 are marked with open red symbols. In the bottom right corner a mean error for the points in the plot is show. A black dashed line represents the 1:1 diagonal. Grey lines represent the constraints used for the selection.
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