The Step property is used to change the step between Ticks, the distance between neighbor Major ticks. By default, the value of the Step property is set to 0. The picture below shows an example of a chart with the Step is installed to the 0 default value.
As one can see, if the value is 0, then the distance between two between neighbor Major ticks by the Y axis is 0.5, and 1 by the X-axis. If to set the Step property to Z value, then the report generator will multiply Z value by the value of the unit interval. The result obtained is the distance between two neighbor Major ticks. The picture below shows an example of a chart, with the step on the Y axis set to 1,5, and the X axis value set to 1:
