A high-low chart draws a single line from the low to the high of each point - a clean way to show ranges like a day's temperature span or a stock's trading range.
Anywhere you care about a range rather than a single number: daily temperature lows and highs, the day's trading range for a stock, or the spread of estimates around a value.
Each point needs a category or date and two values, a low and a high, which you map to the Low and High properties of the series.
A high-low series draws a thin line between the two values, while a range bar fills the space between them. High-low keeps things light when you have many points to show.
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