Zooming and panning on graphs
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Tight clusters of points which cannot be differentiated can occur. To zoom in on an area, select the normal mode button (left hand button with arrow icon) then move to the top left corner of the area to be enlarged, then hold down the left hand mouse button and drag to the lower right hand corner of the area you require, and release the button. An enlarged view of the selected area will be displayed.
As you drag down from upper left to lower right corner of the area to be enlarged the area will appear as a pale yellow panel on the plot.
When you release the button this pale yellow area will fill the plot. Using this zoom facility can allow you to distinguish between labels of tightly-clustered points.
To return to the original view, hold down the left hand mouse button and move upwards from the lower right to the upper left corner and release.
To pan the graph hold down the right hand mouse button and move the mouse.