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VPLOT

The VPLOT file format (.vpl suffix) is a self-contained binary data format that describes in vector format how to draw a plot on the screen or a page using an interpreter. Since VPLOT is not a standard imaging format, VPLOT files must be viewed with interpreter programs which, for historical reasons, are called pens. Each pen interfaces VPLOT with a third-party graphing library such as X11, plplot, opengl, and others. This flexibility makes VPLOT files almost as portable as standard image formats such as: EPS, GIF, JPEG, PDF, PNG, SVG, and TIFF. Unlike rasterized formats, VPLOT files can be scaled to any size without losing image quality.