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Fig. 9.
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Fit of the surface brightness of LOFAR HBA images at 40″ × 40″ (top, see inset) and 134″ × 134″ (bottom, see inset) with a double spherically symmetric exponential model (Eq. (3)). In both cases, residuals from T1 and T2 were masked and the width of the sampling annuli is half of the beam FWHM.
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