There are seven document styles and style options available at SRC that are not described in the manual: the proc style option for making camera-ready copy for conference proceedings, the bezier option for drawing curves, the ifthen option for implementing if-then-else and while-do control structures, the srcletter style for making letters, the showidx option for printing index entries in the margin, the makeidx option for use with the MakeIndex program, and the ps style option that uses Times Roman fonts. See Section for further information on the MakeIndex program that uses the makeidx option. The ps option is described in Section ; the remaining stye options are described below.