Hello,

I am probably missing something very simple here but I am posting my
question because I can't seem to find the answer in the tutorials I have
read.  I am trying to equation for a derivative.

{dV(x)} over {dx} line rsub {x^*}

the term "line rsub {x^*}" is the mathematical representation of
evaluating the earlier derivative where x = x*.  I am just looking for
the key work for creating a vertical line.  Looking through the tutorial
I see the keywords lline, rline, mline.  However, none of them seem to
really apply.  

Your help would be greatly appreciated,

Scott

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