The effect of the interaction with other fields, to be compared with Fig. 1. Adding a term like eq. (4.4) with β1 = 0.3 the would-be overshooting solution (dash-dotted line) reaches the tracker in time. 

The effect of the interaction with other fields, to be compared with Fig. 1. Adding a term like eq. (4.4) with β1 = 0.3 the would-be overshooting solution (dash-dotted line) reaches the tracker in time. 

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