If you explicitly specify the margins for the report with the .leftmargin and .rightmargin statements, these values are used. Otherwise, Report-Writer determines the minimum and maximum print positions for a line in the report while scanning the report formatting statements. If only one of the margins is explicitly stated, Report-Writer determines the other one during the scan. Report-Writer uses margins derived in this manner to determine line positions for the .center, .right, or .left statements, when these statements are used without specified parameters.