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Fig. 4
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Relative knot offsets for the three epochs of observations. A weighted least-squares fit is plotted in red and indicates a proper motion of 9.60 ± 0.66 mas yr−1 for knot E3 (top) and 9.38 ± f .54 mas yr−1 for knot E1 (bottom). The filled gray bars indicate the 1σ uncertainty of the fits.
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