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As BarTimeFrame documentation states, this is the time in seconds for each bar on the CategoryDateTimeAxis.
Actually, it allows you to specify the time for 1-bar (or one point) on the chart in seconds, e.g. CategoryDateTimeAxis.BarTimeFrame=900 means each point on the chart represents 15 minutes. This is used for financial charting to assist the range and zoom calculations in the X-axis. It is set to “-1” by default, which means that time frame is calculated by CategoryDateTimeAxis automatically, you can set it to any value greater than zero.
Please, take a look at our SciTrader example and play around with different time frames on the left top corner to see it in action.
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