Fig. 4.
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Flux density (top) and spectral index (bottom) measured in the 12.5″ beam-sized regions shown in Fig. 2 as a function of distance and estimated age. The continuous lines show the best-fitting model (χ2/d.o.f. = 29.5/17) assuming minimum aging (B = 2.3 μG) with a projected velocity of 780 km s−1. The dotted lines show an extrapolation of this model.
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