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plot discrete spectrum


Is there an easy way to do a ListPlot[{{{x1, y1}, {x2, y2}, ..., {xn,
yn}} in which each a perpendicular is dropped from each dot to the
horizontal axis?

Of course, when can combine the ListPlot with a Graphics object
consisting of line segments.  I prefer a way that avoids using graphics
primitives directly.

The sort of plot I want is what's usually done to display, for example,
the energy spectrum of a Fourier series.

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.       phone 413 549-1020 (H)
Univ. of Massachusetts                     413 545-2859 (W)
Amherst, MA 01003-4515


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