What does the possession 'swing' on a lathe imply?

If the distance from the spindle centre to the bed is 6 inches, does that make the 'swing' 6 inches or is it double self a 12 inch 'swing'? Is it measured on the the diameter or the radius of the 'work piece'?
"> It is the maximum diameter of the workpiece. Some lathes are designed with a gap between the bed rail that allow the part to swing below the bottom of the headstock.

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