Ah - I think I have got you now (but maybe not !!)

I am taking it that you have a list of SD values ??

And let's remember that each SD value is a plus and a minus value

Here is what I would do :

Copy your list of values so you have the same identical values in 2 columns.

Sort one list of SDs ascending (these represent the pluses)

1

2

3

4

Sort the other list of SDs descending (these represent the minuses)

4

3

2

1

Now copy the second descending list values under your first list so you now have one list e.g.

1

2

3

4

4

3

2

1

Highlight your data list, hit F11 to automatically graph it. This will produce a bar chart of your data.

Right Click the graph anywhere, select Chart Type, select Custom Types and select Smooth Lines.

Hopefully this will graph your data as you need it.

Cheers,

D