CurveInserts a line that curves smoothly through the points you click in the active window. Click where you want the shape ...

CurveInserts a line that curves smoothly through the points you click in the active window. Click where you want the shape to start, and then move the mouse, clicking wherever you want to add a curve. To end the shape and leave it open, double-click or press ESC. To close the shape, click near its starting point.