Principle

To use the chart, : position the crosshair cursor at the point whose interval you wish to get, and double-click.

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Chart
Narrow line / Bold line:

These items allow you to change the line width of the plot


X-axis/Y-axis:

These items allow the setting up of the maximum, and minimum and units per division of the charts.  This feature can be used to zoom in on the desired portion of the graph.
