| Very embarrassing, I just noticed that SPX and SP500 future have different reading numbers. For example, June 24th, SPX lowest reading is 1560. The SP500 future (http://www.finviz.com/futures_charts.ashx?t=ES&p=h1) reading is 1553.
 Previously I mentioned 1550 which came from SP500 future chart.  If using SPX, the number becomes 1560.
 
 In the future, I will only use SPX number to avoid any confusion.
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