Well-designed graphics are frequently the best way to understand data sets and to communicate results. Gnuplot, the most popular open-source tool to plot and visualize data, has long been the preferred choice for scientists and data analysts for creating publication-quality graphs. The latest version, gnuplot 5, adds further capabilities, including new plot types, improved text and color handling, and support for interactive, web-based display formats. Although gnuplot includes comprehensive reference documentation, it can be difficult to fully master this tool. Gnuplot in Action, Second Edition is a major revision of this popular and authoritative guide for developers, engineers, and scientists who want to learn and use gnuplot effectively. The book starts with a tutorial introduction for readers new to gnuplot. Next it provides a systematic overview of gnuplot’s core features, and full coverage of gnuplot’s advanced capabilities, such as 3D graphics and false-color plots. Experienced readers will appreciate the discussion of gnuplot’s new features for working with color and customized plotting styles, as well as the hints for improved workflow and user configurations. The book concludes with chapters on graphical effects and general techniques for understanding data with graphs.