The x-axis is initially scaled to show the spread of in-degrees from 0 to the maximum found (or to the cut-off value). If the cut-off value is shown, ``+'' is added at the end of the x-axis indicating that in-degrees equal to or greater than the cut-off value occurred.
If the maximum in-degree found is greater than 25, the x-axis can be re-scaled by entering a new maximum in-degree. Note that the if there are excess in-degrees (off the scale) their total frequency will be shown as a black column on top of the maximum in-degree column, and ``+'' will be added to the x-axis.