Tecplot is an extensive, interactive software for graphic processing of scientific data. It is suitable to create X-Y representations, grid views, contour and smoke line illustrations, shaded surface representations and representations of functions. Furthermore, there are several versatile 3-D options available: Isosurfaces, 3-D flow lines, 3-D flow threads, 3-D railroads, 3-D vectors, 3-D intersections, 3-D sections etc. The intuitive GUI (graphical user interface) is the same for the various user interfaces of the different operating systems (WIndows and several UNIX). This environment facilitates the preparation and interactive design of presentations with pages that have up to 128 individual plots.