Ratio of the expected flux density derived from the combination of two other surveys over the flux density as measured in LoLSS as a function of flux density in LoLSS. In this case, the expected flux density is extrapolated using a spectral index derived from the combination of the following surveys: LoTSS-NVSS (top), VLSSr-NVSS (middle), and 8C-NVSS (bottom).
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