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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 16.2.9, p. II-282.
+% Original source in file "fonts2.TEX", starting line 958.
+\wlog{L: "spacefac.tip" ["fonts2.TEX," l. 958, p. II-282]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\def\SaveSpaceFactor{%
+ \xdef\@SavedSpaceFactor{%
+ \spacefactor = \the\spacefactor
+ }%
+}
+\def\RestoreSpaceFactor{%
+ \@SavedSpaceFactor
+}
+\catcode`\@ = 12