Dividers are called like this as they divide the chart to parts. Three types of dividers are defined. ‘---’ draws a horizontal line across the entire chart with potentially some text across it. ‘...’ draws no horizontal line, but makes all vertical entity lines dotted, thereby indicating the elapse of time.

The third type of divider is a simple vertical space. This can be specified by entering just attributes in square brackets. The extreme ‘[];’ simply inserts a lines worth of vertical space. You can add text, too by specifying a label. See Dividers for examples.

Dividers take the label, color, text.*, line.*, compress, vspacing, number and refname attributes with the same meaning as for arrows. In addition, the type of the vertical line can be specified with vline.*, with vline.type defaulting to dotted for ‘...’ dividers and to solid for ‘---’ dividers. Other values are dashed, none and double. Again, note that the default values can be changed by using styles, see Defining Styles.