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Fig. 4


Integrated flux density of M 51 with a power law fit of slope α = −0.79 ± 0.02. The integrated flux values of 11 ± 1.5 Jy from Israel & Mahoney (1990) at 57.5 MHz and 31 ± 8 Jy at 26.3 MHz (Viner & Erickson 1975) are also plotted.

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