Below is the SPY 5-Year Chart with 61.8% retracement level from 2007 peak/2009 trough. It is testing uptrend channel support from the March 2009 low.
SPY short term chart. It broke through the uptrend channel from February on strong volume.
DIA is at the 61.8% retracement (dotted lines) on this 4 year Chart. Look at the rising wedge as well. Support desperately needs to hold if it loses strength. It also looks like DIA
Look At DIA from the March low. The uptrend channel still intact with the 50dma at 106, support 107ish. Important levels.
From the February 2010 low, DIA pierced the uptrend from the February bottom on strong volume but did not take out the uptrend from late Feb.