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Fig. 2.

image

Total integrated radio continuum spectrum of M 51 with a fitted power law, giving a total spectral index αtot = −0.81 ± 0.05. The flux densities and references are listed in Table 2. Bottom left corner: zoom in to the S-band frequency range with the integrated flux densities of the spectral window images. The data points marked with * in the legend are from this work.

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