The user can "zoom" in on the image by using dragging the mouse (holding button 1 down) in the plot window. As the mouse is dragged a rectangle is drawn, defining the area which will be scaled to occupy the entire plot window upon the release of the mouse button.
Note, because the user can define a rectangle that is not a perfect square, the resulting image may have different scaling factors for the x and y values. This could result in an image that looks greatly distorted from the original. To avoid this, try to define a square area.
The user may wish to change the interval of the grid lines and grid values printed along the axes after scaling. This is done by choosing the Grid Spacing and Scale option under the Options Menu.
To zoom back out, the user simply presses the second mouse button anywhere in the plot window.
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