Axis Tick Marks
The chart automatically sets up the axis with both major and minor ticks. Customizing the tick spacing or attributes is as easy as manipulating a set of properties.
The MajorUnit and MinorUnit properties set the state of the Axis' tick marks. To eliminate clutter in a chart, you can display fewer labels or tick marks on the category (x) axis by specifying the intervals at which you want categories to be labeled, or by specifying the number of categories that you want to display between tick marks.