This chart shows simple moving averages of the differences in the high and low prices across the time frame you choose.
I use this when researching to see if the investment vehicle meets my criteria for volatility within the time-frame I want to invest.
The columns show the percentage difference between the current candle's high and low.
The lines show the SMA of the past 10(red), 30(orange), and 100(blue) candles, but you can edit these to be whatever you'd like.