Parallel coordinates are an established technique to visualize multivariate data. Since these graphs are generally hard to read, we need interaction techniques to judge them accurately. Adding to the existing brushing techniques used in parallel coordinate plots, we present a triangular selection that highlights lines with a single click-and-drag mouse motion. Our selection starts by clicking on an axis and dragging the mouse away to select different ranges of lines. The position of the mouse determines the angle and the scope of the selection. We refined the interaction by running and adapting our method in two small user studies and present the most intuitive version to use.

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