  Structure of the eigenfrequencies parameter space for three and four
dissipatively coupled van der Pol oscillators is discussed. Situations of
different codimension relating to the configuration of the full synchronization
area as well as a picture of different modes in its neighborhood are revealed.
The organization of quasi-periodic areas of different dimensions is considered.
The results for the phase model and for the original system are compared.

Chaotic Dynamics;Computational Physics