n1 (Length) is the maximum number of lines on a page; n1 cannot be smaller than 13. +n1 Increases the current page length by n1 lines. -n1 Decreases the current page length by n1 lines. n2 (Width) is the maximum number of characters on a line for running heads; n2 cannot be larger than 150. +n2 Increases the current page width by n2 characters. -n2 Decreases the current page width by n2 characters.