To draw a line, select a line icon (Data Flow or Control Flow).
Use one of the following procedures to draw splines and straight-line segments:
● Click and drag the cursor to draw the line. When you hold down the Shift key, the resulting line is horizontal or vertical.
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● To end a line on an invalid end point, press the middle mouse button. An invalid line is denoted as such with a line at the end of the arrow head.