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+	Phase Dispersion Minimization
+
+	?      list options
+	h      graph data
+	i,k    graph theta (abscissa) verses frequency or period respectively
+	p      graph phase curve for period/frequency at cursor x position (th)
+	d,u    delete or undelete respectively the point nearest cursor  (d,ph)
+        f      call ICFIT on displayed data                 (data or phase plot)
+        j      subtract fit from data, use residuals
+	s      set sample range for calculations            (data plot)
+	t      reset range to entire dataset                (data plot)
+	g      significance of theta at cursor x position   (theta plot)
+	a      amplitude and epoch at cursor x position or of plot (th,ph)
+	,      set minp or minf to cursor x position        (theta plot)
+	.      set maxp or maxf to cursor x position        (theta plot)
+	m      mark range and find minimum in this range    (theta plot)
+	e      turn on/off error bars on phase plot, and if (phaseplot), replot
+	r      replot
+	x      remove a trend from the data by removing a bestfit line
+	z      flip the y-axis scale
+        q      quit
+
+	The following commands may be abbreviated.  If entered without an
+	argument; :minp, :maxp, :minf, :maxf, and :ntheta will display the
+	named parameter; :show, :vshow will print to STDOUT; :signif, :ampep,
+	and :phase, will do the calculation at the remembered period.
+
+	:show [file]		show parameter settings
+	:vshow [file]		show verbose information
+
+	:minp :maxp [period]	set/show min/max search period
+	:minf :maxf [frequency]	set/show min/max search frequency
+	:ntheta [number]	set/show number of points for theta
+	:sample [value]		set/show the sample ranges
+
+	:signif [period]	find theta significance
+	:ampep [period]		amplitude and epoch
+	:phase [period]		graph phase curve
+
+	:unreject		unreject all the data points
+	:alldata		reset range to entire dataset
+	:origdata		reset data to original dataset