Abstract
We study the potential between static SU(4) sources using the model of thick center vortices. Such vortices are characterized by the center elements z{sub 1}=i and z{sub 2}=z{sub 1}{sup 2}. Fitting the ratios of string tensions to those obtained in Monte Carlo calculations of lattice QCD we get f{sub 2}>f{sub 1}{sup 2}, where f{sub n} is the probability that a vortex of type n is piercing a plaquette. Because of z{sub 2}=z{sub 1}{sup 2} vortices of type two are overlapping vortices of type one. Therefore, f{sub 2}>f{sub 1}{sup 2} corresponds to the existence of an attractive force between vortices of type one.
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