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From: David Arnold <darnold@northcoast.com>
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Subject: Spacing in \pmatrix{}
Date: Sat, 10 Nov 2001 20:58:47 -0800
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Don et al,

I have:

\pmatrix{%
 x_{1}^{(k)} \cr
 x_{2}^{(k)} \cr
 x_{3}^{(k)} \cr
 \vdots  \cr
 x_{n}^{(k)}}

I would like to open up the spacing by about 3pt between each row of the
matrix. What's the optimal solution in plain TeX?