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A quasi-two-dimensional, lateral ac-powered gas discharge system is investigated experimentally from the point of view of pattern formation. In a certain parameter range, well localized self-organized quasiparticles in the shape of current density filaments are observed. By varying the supply voltage, such objects can be destabilized and stationary filaments with a circular symmetry undergo a transition towards breathing filaments of dumbbell shape.
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Müller et al. (1999) studied this question.
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