1# line-length 2 3A *line-length* is an expression that specifies how long to draw a 4line segment. The value can be either absolute (ex: "`1.2cm`", 5"`.5in`", "`0.5*circlerad`", and so forth) or it can be a percentage value 6(ex: "`85%`"). 7 8 * *expr* 9 * *expr* **%** 10 11If the percentage value is used, the basis is usually the 12value stored in the "`linewid`" variable. However, for a case of 13either 14 15 * **up** *expr* **%** 16 * **down** *expr* **%** 17 18Then the percentage refers to the current "`lineht`" value instead. The 19"`linewid`" value is always used for headings even if the heading 20is "`0`" or "`180`" or "`north`" or "`south`". 21 22In most cases it does not matter whether "`linewid`" or "`lineht`" 23gets used for the percentage basis since both variables have the 24same initial default of 0.5in. 25