How to create curved line segments in PE v. 4?

Specifically, I want to superimpose curved lines onto a scanned drawing. Thanks in advance.

Tony,
Unfortunately PSE does not have the best drawing tools, but here is way to draw a curve:
1. Create a new layer.
2. Draw an oval with the Elliptical Marquee tool.
3. Edit>Stroke the oval, then erase portions of the oval leaving just the curve.
4. To fine-tune the shape, activate the Move tool and drag the various handles.

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