Possible Double Bottoms   

A downward price trend bottoms out, rises, and then bottoms again before climbing.

Prices trend down and should not drift below the left bottom. There should be a 1% -2% rises or more between the two bottoms, measured from low to high. Bottom to bottom price variation is 0.5% or less. Bottoms should be at least a few hours apart. The confirmation point is the highest high between two bottoms.
Trading tactic
Compute the formation height by subtracting the lowest low from the confirmation point. Add the difference between the two bottoms. The result is the expected price move. When compared to Double Bottoms the probability of price rising is less, but the possible gain can be greater.