Fig. 5.
Flux density at 6 GHz obtained with the best-fit procedure for VLA 12C plotted in the space 
. The hatched area shows where the expected synchrotron emission is null since the acceleration process is inefficient, while the two grey areas show the regions where the constraint given by the ionisation rate estimated by observations, ζobs, is not satisfied, namely ζobs ∉ [ζ2, ζ1].
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