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Most charts show one point at a time on a Cartesian (x/y) coordinate. That is, a single point might indicate that July sales were $525MM while August sales (a second point) were $350MM. The chart might also show a line connecting the two points to show the change in value. But each individual entry is typically a single point on the coordinate system. With stocks, we’d like to show four bits of information for each entry: the opening price, the closing price, the high for the day, the low for the day. There is no good way to do this by drawing points on an...