Sets the interval frequency value of a Chart left axis. Interval frequency is a Chart property that determines how the left axis scale should display. This property is available also on the General Properties dialog, Values Axis tab. When the Interval Auto check box is disable, you can specify how refined you want the left axis displayed.
This example shows how to change the left axis to display the data in intervals of twenty thousand:
ActiveDocument.Sections["AllChart"].ValuesAxis.LeftAxis.IntervalFrequency=20000