Spectral properties of sources in the NVSS/GB6 sample.
Notes. For each flux density range the columns indicate the total number of sources, the number of steep- and flat-spectrum (+inverted) sources, and the median values of their corresponding spectral index distributions; in the last column, the number of inverted-spectrum sources (α ≥ 0.3) is also given. αpeak and σα indicate the parameters of the best-fit truncated Gaussians for steep- and flat-spectrum sources (see Sect. 3.2).
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