Sets or returns the number of categories to show between tick mark labels.

 public int CategoriesBetweenTickMarkLabels{ get; set; }

Public Property CategoriesBetweenTickMarkLabels() As Integer

This property corresponds to the "Interval between labels" property under "Axis Options".

By default, this value is 1, which also happens to be the minimum allowed value. In Xlsx, the maximum allowed value is 999999999. But in Biff, the maximum allowed value is 31999. If you set this property to a value out of bounds, it will be clamped to the nearest allowed value.

This property has no effect when the category axis will be interpreted as a date axis.