Key Zoom Ratio

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Pushing the Page Up and Page Down buttons will zoom the axes in the graph tool.  This number determines the ratio that the scale is increased or decreased by.

 

For example, the default Key Zoom Ratio is 1.33333.  If you axes have maxima of 10 and minima of -10, pushing the Page Up button will change the maxima to 13.33333 and the minima to -13.33333.