.50 retracement from the 8/3/06 low to the 1/16/07 high = 438.18
1.272 extension from the 12/21/06 low to the 1/16/07 high = 435.84
1.618 extension from the 2/12/07 low to the 2/22/07 high = 436.96
This happened to coordinate beautifully with a time histogram that
stood out on 3/5/07 for a possible low to develop. With time and price
coming together, what you have to look for next is a trade entry trigger.