Here is a thirty minute bar chart of the day session e-mini action over the past two weeks. Today the market got to within a couple of point of the top of my range estimate which was 773. Volume steadily decreased as the market rallied. Even though this is normal for mid-day trading, I thought it was significant because the market usually rests in mid-session, and only rarely trends then. If it does trend on low volume as it did today, a substantial reaction is generally not long in developing.
In any event I estimate that this reaction will run somewhere between 20-23 points, roughly the same size as previous reactions in the uptrend (blue rectangles). Midpoint resistance near 748 catches my eye (purple dotted line). A reaction to that level would be exactly 23 points. So I am guessing that the market is now on its way down to 745-50.