The chart pattern of the Big M is accomplished according metrics descripted in the Chapter 1 of the book 'Chart Patterns: After the Buy' by the author BULKOWSKI, Thomas N.
The rules of the Big M stablished a breakout (D) dawnward of 7% average (less than 10%) from the valley (B) between the Double Tops (A, C) and a pullback upward in formation of the right peak (E). The CORRECTION from the peak E projects an 17% average above the valley-line (B).