Use the field/slider to specify the maximum number of principal components to compute and plot.Principal components are computed only when there are no With Variables. The number of displayed principal components is determined by either this number or the number corresponding to the Cumulative Proportion of Variation to Explain, whatever is smaller.Tip: To change the scale of the slider, right-click on the slider and select from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click .