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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 8.1.3, p. I-264.
+% Original source in file "vboxes2.TEX", starting line 193.
+\wlog{L: "nathd.tip" ["vboxes2.TEX," l. 193, p. I-264]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newbox\@NBox
+\def\NaturalHeight #1#2{%
+ \setbox\@NBox = \vbox{\unvcopy #2}
+ #1 = \ht\@NBox
+}
+\def\NaturalDepth #1#2{%
+ \setbox\@NBox = \vbox{\unvcopy #2}
+ #1 = \dp\@NBox
+}
+\catcode`\@ = 12