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The authors present a robust and fast loop-detection strategy to interactively place dense, uncluttered, evenly spaced streamlines, which help visualize complex flows. Although loop detection is critical to streamline placement, few researchers have addressed this issue. In this paper an effective, robust, and fast loop-detection strategy for creating evenly spaced streamlines is described. At a negligible additional cost, it allows interactive streamline placement for complex flows on an ordinary PC.