Prey-Predators systems 
Variation of all parameters
Vary the parameters \(A\), \(B\), \(C\) and \(D\) and observe the deformations caused on the vector field.
Activate the orbits option to observe the solution curves. Vary \(A\), \(B\), \(C\) and \(D\) and detect the changes in some solution curves.
Activate the fishing option (by previously deactivating the orbits option) to access the parameters \(E\), \(F\) and \(P\) of the last system. Vary \(A\), \(B\), \(C\), \(D\), \(E\), \(F\) and \(P\) and observe the deformations caused on the vector field and the effect on the mean values \(\overline{x}\) and \(\overline{y}\).
