The TimeTracker and the StatePublishers
The TimeTracker is a red vertical line which position is shared among all the PlotWidgets.
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The position of the TimeTracker (A) can be changed either pressing SHIFT + LEFT MOUSE on a certain location of a PlotWidget, or moving the time slider at the bottom of the screen (B).
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The exact time will be diplayed in the box at the left side of the time slider (C).
To customize the way time is displayed, you can show/hide extra option pressing the gear shaped icon (D).
Even if, apparently, the TimeTracker is just an enhancement of the UI, it hides a more usefull functionality.
When it is moved, all the plugins of type StatePublisher are invoked. These plugins are mostly used to display and/or publish data points related to the time selected by the tracker.