Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 175)

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Visualize Data with Symbols
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In the XYPlot below, you can see an XYPlot cursor at the Y axis that is not
yet intersecting any points on the plot.
You can also see an XYPlot cursor that was dropped on a point. The X and
Y values appear in small boxes outside the axes.
Using the mouse, you may position and release the cursor over any pair on
the XYPlot. If the cursor is dropped on an area that contains no points, the
cursor snaps to the nearest pair.
Move the XYCursor from Point to Point
Once you have dropped an XYCursor on a point, use the arrow keys to
move from point to point in time order. For example, pressing the right
arrow key moves the cursor to the pair that is plotted immediately after the
current pair in the same series. The left arrow moves the cursor to the pair
that is plotted immediately before the current pair in the same series. The
up arrow moves the cursor to the first pair in the previous series. The down
arrow moves the cursor to the first pair in the next series. The cursor looks
the same when it is dropped.