Radiative age map (left) and relative error map (right) obtained from Fig. 3 by assuming B = 2.1μG and Γ = 2.4. The black contours are the same 1.4 GHz contours reported in Fig. 2, middle panel. The map displays the upper limit of the time required to steepen the spectral index of the synchrotron emission from − 0.7 to the value reported in Fig. 3.
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