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Using this flux decomposition, we are able to convey advective\u2010diffusive concentration transport using integral lines. In order to visualize superimposed flux effects, we introduce a new graphical metaphor, the stream feather, which adds extensions to stream tubes pointing in the directions of deviating fluxes. The resulting unified visualization of macroscopic advection and microscopic diffusion allows for deeper insight into complex flow scenarios that cannot be achieved with current volume and surface rendering techniques alone.<\/jats:p>Our approach for flux decomposition and visualization of advective\u2010diffusive flows can be applied to any kind of (simulation) data if velocity and concentration data are available. 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