Model-fit components. Top left: entire field; top right: zoom in the outer component region; and bottom: zoom in the central shell region. The crosses indicates the position, size, and orientation of the model-fit Gaussian components. The solid and dot-dashed lines represent 5 GHz and 1.6 GHz observations, respectively. The different colours show different epochs as described in the legend; the subscript indicates the observing frequency. The dotted curve shows the best-fit ellipse to the set of components at day 70. The reference position for all fields is at RA 21h 02m 09.81700s, Dec. +45° 46′ 32″.68253. The hatched (almost circular) ellipses in the bottom right corner show the HPBW at 1.6 GHz (from day 91) and 5 GHz (from day 70), for reference.
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