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The function that is being displayed in the heart pane, as well as various display options that can be be selected from the Heart entry on the menu bar:
The image shown in the heart pane may be copied to the clipboard by selecting Copy from the Heart menu, or by pressing Ctrl-C while the mouse is within the heart pane.
The most frequently used surface functions may also be activated by clicking on the corresponding button on the tool bar at the top of the heart pane.
If transmembrane or epicardial potentials are displayed, the status bar indicates the time instant for which the potentials are displayed. You may press the up and down arrow keys to in- and decrease time by steps of one millisecond. Use the page up and page down keys for in- and decrements with steps of ten milliseconds. Also, you may click in the membrane and ECGs pane on the time instant for which you wish the potentials to be displayed. Finally, you may use the movie option to view the development in time of the potentials as a movie.
You may choose whether the size of the range around the selected node that is affected by changes of the source parameters at the selected node (see range) should be shown on the heart surface. You may choose to display the outline of the range, to dim the region of the heart surface that is within the range, or to dim the region outside the range. You may also turn the range display on and off by using the range on/off button on the heart tool bar. The size of the range may be controlled by using the mouse.
The heart surface may be hidden or made transparent. If a function is mapped on the heart surface using a color code, the surface will always be opaque, since a colored transparent heart is too confusing. Should you want to map a function on the heart while being able to see through the surface, use isofunction lines only.
The heart vector and vector loop (according to the Frank Leads) for the simulated data may be displayed by choosing opaque for the corresponding items. The scale of the vector is 13 cm/mV times the scale factor of the signals in the ECGs pane. You may change the size of the displayed vector by using the scale in the ECGs pane.
Finally, you may select in the geometry tab whether the grid and/or the nodes that make up the discretized heart should be displayed.
By default, the scale of time functions (repolarization, depolarization and action potential duration) is adapted automatically as the timing values change. By unchecking the Autoscale check box, manual control by means of the three timing sliders is enabled.
You may easily return to the standard frontal view by clicking on the reset orientation button on the tool bar.
If a function is mapped on the heart surface, the value at the selected node is displayed on the status bar of the heart pane. If the geometry is displayed, the location of the selected node and its index are displayed (the node index corresponds to the row in which the source parameters for that node are saved).
In the membrane pane the transmembrane potential of the selected node is displayed.
The size of the range may also be set from the range dialog window in the membrane menu. In this dialog window you may also choose whether the range should be computed through the myocardium (transmuraly), or merely on the part of the heart surface that carries the selected node.