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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 7.5.5, p. I-249.
+% Original source in file "vboxes1.TEX", starting line 2107.
+\wlog{L: "vcentx.tip" ["vboxes1.TEX," l. 2107, p. I-249]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newbox\@VcenterXBox
+\newdimen\@VcenterDimen
+\def\VcenterX{%
+ \hbox\bgroup
+ \mathsurround = 0pt
+ \futurelet\@VCenterXToken\@VCenterXA
+}
+\def\@VCenterXA{%
+ \ifx\@VCenterXToken\bgroup
+ \let\@VcenterXNext = \@VcenterXOrdinary
+ \else
+ \ifx\@VCenterXToken t%
+ \let\@VcenterXNext = \@VcenterXTo
+ \else
+ \let\@VcenterXNext = \@VcenterXSpread
+ \fi
+ \fi
+ \@VcenterXNext
+}
+\def\@VcenterXOrdinary{%
+ \def\@VcenterCommand{\vcenter}%
+ \afterassignment\@VcenterXB
+ \let\@VcenterDrop =
+}
+\def\@VcenterXTo to{%
+ \def\@VcenterCommand{to}%
+ \afterassignment\@VcenterXToSpread
+ \@VcenterDimen =
+}
+\def\@VcenterXSpread spread{%
+ \def\@VcenterCommand{spread}%
+ \afterassignment\@VcenterXToSpread
+ \@VcenterDimen =
+}
+\def\@VcenterXToSpread{%
+ \edef\@VcenterCommand{%
+ \vcenter\@VcenterCommand \the\@VcenterDimen
+ }%
+ \afterassignment\@VcenterXB
+ \let\@VcenterDrop =
+}
+\def\@VcenterXB{%
+ \setbox\@VcenterXBox = \hbox\bgroup
+ $%
+ \@VcenterCommand\bgroup
+ \aftergroup\@VcenterXC
+}
+\def\@VcenterXC{%
+ $%
+ \egroup
+ \box\@VcenterXBox
+ \egroup
+}
+\catcode`\@ = 12