Line chart with avg line across dimensions + min and max values

[#1]

all,

I have a chart shown below with an average expression across a dimensions on the bottom. The two red lines is what i would like to show. I want these red lines to me the MAX and the MIN for the given dimension where that AVG line hits. Let me know if you have any questions. Basically find the avg (expression) across the dimension but then have two complimentary lines for that dimension that show the Max value and Min value that the expressions is averaging.

Blue = Avg line expression

Red- Max and Min (drawn out) but end goal for expression. Max and min value off of the avg value for the dimension    

[rwunderlich]

If your expression is

avg(value)

then add two more expressions:

min(value)

max(value)

Or am I missing something?

-Rob

[#3]

That will create a static line for both. I want to take the Max(Value) + Min(Value) of the Value that was Averages for the specific dimension. I think I got it to work with aggr by the dimension but the axes have to large of a variance between the two.