Standard Deviation Channel information

[MisterDog]

I would like to find the price difference between the outer lines of a Standard Deviation Channel. The points that are marked A and B. I can find the price and time of the center line but this doesn't seem to be helpful. I've also explored using iStdDev. Does anybody have an answer how to find the price at these two points?

 

[qjol]

A = center + iStdDev(Symbol(), Period(), 54, 0, MODE_SMA, PRICE_CLOSE, 0);
B = center - iStdDev(Symbol(), Period(), 54, 0, MODE_SMA, PRICE_CLOSE, 0);