US30 20150714

Below calculation requires some knowledge of wave theory and some high school math...

assume a ABC expanded flat is complete,

range of A=247;
range of B=357;
range of C=524 where
1.4453*A=B;
1.4678*B=C;
2.1215*A=C

take sq. root of 2.1215, we get 1.45654;
mean/average of 1.4453 & 1.4678 is 1.45655.

So, GM=AM but they rarely matches...

of course, most importantly, the rebound has reached 50% of the previous wave (not range)