See the example below: In the YM case, the vertical lines represent two minute time boundaries. This is a great assistance when using a range chart alongside an intraday bar chart. It clearly shows how each bar formed, etc. The ES has 5 min lines.
I know that there are vertical lines on any chart but they are fixed width intervals, and on a range chart, that does not make much sense to me.
BTW, please note on that example, that there are three colors for both price & volume: up, down, and NO Change. No change is just as important as up or down.
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