High-resolution, frequency-integrated image of Cyg A between 111 and 249 MHz (left), and peak brightness of the hotspots A (top right) and D (bottom right), extracted from the high-resolution images of the 100 output channels (black solid line, with 1σ uncertainties shown as a grey shaded area). The fits using a second-order (blue dashed line) and a first-order logarithmic polynomial function (red dot-dashed line) are also shown, with the best fit parameters reported in the same colours. The latter has been fitted only between 111 and 181 MHz for a consistent comparison with MK16. The image on the left has a noise level of σ = 10 mJy/beam, with contours starting at 1 Jy/beam and increasing by a factor of 2.