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Please, note that the BarSeries are usually used to visualize categorical data. Each category is visualized in a separate axis slot and thus the bars never overlap. When categorical axis is set, the bars could be clustered or stacked depending on the value of the series CombineMode property.
If you have continuous data, you may consider using another type of series that is better suited for such scenario. If your data could be categorized, you could try the DateTimeCategorical
Axis, and specify its DateTimeComponent property depending on the chart Zoom.
If no properties are specified, the DateTimeContinuous
Axis automatically calculates its major step in such way that the ticks look good. But since the data is continuous, nothing can stop the bars from overlapping. You may try to control the width of the bars with the axis GapLength property that sets the width of the bars based on the width of the tick step.
I hope this gives you some ideas of how the chart works.
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