Components of a Price Bar on a Chart Bar charts can be time-based, tick-based or volume-based. When using time-based data resolution (intra-day, daily, weekly, or monthly), each bar on the chart illustrates the Open, High, Low, and Closing prices for the time increment represented by the bar. When using tick-based data resolution, each bar illustrates the first, lowest, highest, and last tick in the group of ticks comprising the bar. When using volume-based bars, each bar illustrates the first, lowest, highest and last price in the group of transactions comprising the bar.