The CONTRIBUTIONPANEL statement produces paneled contribution plots. You can use the options NCOLS=c and NROWS=r to specify the number of columns and rows in the layout, respectively.
By default, c and r are determined by p, the number of contribution plots to be displayed. If , then and . Otherwise, one of the following three layouts is used to minimize the number of empty panels in the last page of the graph:
,
,
,
If you specify only NCOLS=c, then . If you specify only NROWS=r, then .
Although and by default, you can specify values greater than 4 in the NCOLS= and NROWS= options.