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[S] Reference line - problem

To: s-plus <s-news@wubios.wustl.edu>
Subject: [S] Reference line - problem
From: José Ailton Alencar Andrade <andrade@inep.gov.br>
Date: Mon, 25 Sep 2000 15:13:03 -0300
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    Hello all,

    I am putting reference lines by using the "segments" command. I am
creating a density plot and I would like to put vertical reference lines
from zero to the curve, for that I have to use as reference line length
the value of curve on that point. Firstly, I used as length, the mean
between two points on the curve which the corresponding x values include
the reference point. I know this procedure is not efficient because I
did not get to match exactly the end of reference line with the curve.
    How can I do that? Is there any specific s+ function that does that?

    Thanks.
    Ailton.

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