Increment Between Lower and Upper Values Use this option to specify the increment amount to establish the grid between the upper and lower values. To Specify the Increment between the Upper and Lower Number of Dimensions to Fit: Either type the desired value in the text field or move the slider to the right or to the left to change the value. Tip : To change the scale of the slider, right-click on the slider and select Rescale Slider from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click OK .