The summary plots of Millstone Hill Radar parameters available through the Madrigal Database were generated by Depict. Depict can also be used independently of other Madrigal software. Documentation is sparse. However, experienced C programmers will have little difficulty learning Depict by going through the example program on this page and the examples and library source code in the Depict directory. Depict is based on an older version of Thomas Boutell's GD package, a graphics library for fast image creation.
Documentation is available.
The latest version of GD creates PNG, JPEG and WBMP rather than GIF images.