The color fields in a system composed by two static quarks and two staticantiquarks are studied. In particular, we consider the four particles in thecorners of a rectangle, and two possible alignment of the particles, one inwhich the quarks are at the same side of the rectangle, and the other wherethey are at opposite sides. We use a variational method, to probe not only theground state but also the first excited state. This results permit us toobserve and interpret the flux-tube recombination in the mesons to mesons andthe tetraquark to mesons transitions, for both states. The results are comparedwith previous results for the static potential and the Casimir scalingpredictions.
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