Oh.. I was just reading further.
Do you want to draw the curve then - perhaps as example of something for which you don't have data?
If so - you might be able to create some curves in Powerpoint. (No not freehand, I mean explicitely add a curve object). Ditto Visio and even Office using the shapes toolbar.
Another way though. You can probably stick values into a plotting program (or Excel) and ask it to fit a curve to the points.
Cubic splines are a curve type that comes to mind. These approximate pieces of flexible material pinned to a board/paper (if I recall correctly).
Don't use too many points. Three to five should be fine.
Failing that - I've seen freehand corrections drawn onto board reports. Haha. From a distance it looks ok. : >
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