STATISTICA will adjust the number of minor units to the current step size value. However, you can adjust the number of minor units (as well as the default style and size of minor tickmarks) for each of the axes on the Axis: Minor Units options pane of the Graph Options dialog (accessible from the Format menu). You can specify the number of tickmarks to use or have STATISTICA select the optimum number of minor tickmarks. The length and orientation of the tickmarks are also specified on this tab. Thickness and color of the tickmarks is addressed in the Axis: General options pane.