S&P500 Volume Alternative

I like having volume on my charts for the S&P500 and I was dissatisfied with using the SPY volume or the /ES volume overlayed on the SPX chart... So I created an alternative to volume that only uses the SPX prices.

Can anyone figure out how it's generated? :D Start guessing!

Chart is for Thursday, Aug 30.

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If you look closely you'll see it cannot be generated off candle range or open/close distances as the histogram is different levels for same sized candles. But, it is still generated off of price. Going to be a real head scratcher for you all.
 

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You may get good volume charts for the S&P 500 (not SPY volume) from

http://www.marketvolume.com

Plus you may have modulated (normalized) volume on intraday frames, so, regular morning's and end of the day's volume spikes will not disorder your volume based indicators.
 
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