There are six 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,
and the ps style option that
uses Times Roman fonts. The ps option is described in
Section ; the others are described below.