bold
     This style is meant to replace the old option -b of a2ps 4.3. It is a copy of the black and white prologue, but in which all the fonts are in Bold.

bw
     Style is plain: pure black and white, with standard fonts.

color
     Colors are used to highlight the keywords.

diff
     This style is meant to be used with the udiff, wdiff style sheets, to underline the differences.  New things are in bold on a diff background, while removed sequences are in italic.

fixed
     This style uses exclusively fixed size fonts.  You should use this style if you want the tabulations to be properly printed.

     There are no means to use a fixed size Symbol font, therefore you should not use the heavy highlighting style.

gray
     Gray background is used for comments and labels.

gray2
     Black background is used for comments and labels.

matrix
     The layout is the same as bw, but alternating gray and white lines. There are two macros defining the behavior: pro.matrix.cycle defines the length of the cycle (number of white and gray lines).  It defaults to 6. pro.matrix.gray defines the number of gray lines.  Default is 3.

ul
     This style uses bold faces and underlines, but never italics.  This is particularly meant for printing formatted man pages.