Time dependence of injection term. Blue circles correspond to the days of the radio observations. A red solid line traces the function Qt(t) derived as described in Sect. 2 from the observations during the period between 1517 and 8014 days after explosion and from the extrapolation of αr after the 8014th day. As for the behaviour of the injection term before day 1517, we adopt a simple approximation as described in the text, with βx = 0.8 and dx = 100. Green dashed line represents the case of the steady-state injection. The thin black line is the function Qt = lg(t/ 950).
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