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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 4.1.11, p. I-91.
+% Original source in file "reg2.TEX", starting line 601.
+\wlog{L: "absdimen.tip" ["reg2.TEX," l. 601, p. I-91]}%
+% This file DOES belong to format "texip."
+\def\AbsoluteDimension #1#2{%
+ \ifdim #1 < 0pt
+ #2 = -#1\relax
+ \else
+ #2 = #1\relax
+ \fi
+}