ed wrote:
> I have about 40 points that I wish to graph. I used these points to get a
> logarithmic trendline. Now I want to graph one standard deviation above and
> one below. How do I do that.


I'd use helper columns. Compute the values for the +/- sigma at each X value
and then just add them to your graph in the normal way. There may be something
more clever, but this should work.

Good luck...

Bill