ABSTRACT
Tools such as graphs, diagrams, charts, and maps are commonly used for visual display of data. They are generally referred to as figure in the literature, although this term also includes non-data-based pictures such as of a bone or of a lesion. Visual display is considered a powerful medium for communication and for
understanding the basic features of a set of data. Salient features are often easily brought forth by an appropriately drawn figure. Also, the impression received from such a figure seems to be more vivid and lasts longer than the impression from numeric data. The main function of a figure is to provide perception and cognition of the basic features of the data to the viewer. However, for this an appropriate diagram must be chosen and correctly drawn. A large number of methods are available, and the choice is not always easy.
