.BG
.FN mtext
.TL
Text in the Margins of a Plot
.CS
mtext(text, side=3, line=0, outer=FALSE, at)
.AG text
character vector to be plotted.
.AG side
side (1,2,3,4 for bottom, left, top, or right).
.AG line
line (measured out from the plot in units of standard-sized
character heights).
The default values of graphical parameter `mar' allow
characters can be placed at values of `line' less than or equal to
4 on the bottom, 3 on left and top, and 1 on the right.
.AG outer
logical flag, should plotting be done in outer margin?
.AG at
optional vector of positions at which `text' is to be
plotted.  If `side' is 1 or 3, `at' will represent x-coordinates.
If `side' is 2 or 4, `at' will represent y-coordinates.
`at' can be used for constructing specialized
axis labels, etc.
.KW aplot
.WR
