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+.th PLOT I 6/4/73
+.sh NAME
+plot \*- make a graph
+.sh SYNOPSIS
+.bd plot
+[ option ] ...
+.sh DESCRIPTION
+.it Plot
+takes pairs of numbers from the
+standard input as abscissas and
+ordinates of a graph.
+The graph is plotted on the storage scope, /dev/vt0.
+.s3
+The following options are recognized,
+each as a separate argument.
+.s3
+.lp +5 5
+\fBa\fR	Supply abscissas automatically (they are missing from
+the input); spacing is given by the next
+argument, or is assumed to be 1 if next argument is not a number.
+.s3
+.lp +5 5
+\fBc\fR	Place character string given by next argument
+at each point.
+.s3
+.lp +5 5
+\fBd\fR	Omit connections between points. (Disconnect.)
+.s3
+.lp +5 5
+\fBg\fIn\fR	Grid
+style:
+.lp +5 0
+\fIn\fR=0, no grid
+.lp +5 0
+\fIn\fR=1, axes only
+.lp +5 0
+\fIn\fR=2, complete grid (default).
+.s3
+.lp +5 5
+\fBs\fR	Save screen, don't erase before plotting.
+.s3
+.lp +5 5
+\fBx\fR	Next 1 (or 2) arguments are lower (and upper) \fIx\fR limits.
+.s3
+.lp +5 5
+\fBy\fR	Next 1 (or 2) arguments are lower (and upper)
+\fIy\fR limits.
+.s3
+.i0
+Points are connected by straight line segments in the order
+they appear in input.
+If a specified lower limit exceeds the upper limit, or if
+the automatic increment is negative, the graph is plotted
+upside down.
+Automatic abscissas begin with the lower \fIx\fR limit, or with 0
+if no limit is specified.
+Grid lines and automatically determined limits fall on round
+values, however roundness
+may be subverted by giving an inappropriately rounded
+lower limit.
+Plotting symbols specified by
+.bd c
+are
+placed so that a small initial letter,
+such as + o x, will fall
+approximately on the plotting point.
+.sh FILES
+/dev/vt0
+.sh "SEE ALSO"
+spline(VI)
+.sh BUGS
+A limit of 1000 points is enforced silently.