Graphics are drawn by entering "graph mode" by sending the ASCII Group Separator (GS) character (). After that every set of four characters (or less) received by the terminal are used to define an X,Y coordinate. The first four following the GS position the graphic cursor, every point after that draws a vector on the display. The system is returned to text mode ("alpha mode" in their documents) using a number of commands, typically Unit Separator (US, ), but a number of other sequences also have the same effect, including a .