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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 7.5.7, p. I-254.
+% Original source in file "vboxes1.TEX", starting line 2416.
+\wlog{L: "shiftudb.tip" ["vboxes1.TEX," l. 2416, p. I-254]}%
+% This file DOES belong to format "texip."
+\InputD{chboxd.tip}
+\InputD{box-mac.tip}
+\def\ShiftRefPointUpOrDown #1#2{%
+ \AdvanceBoxDimension{\ht#1}{#2}%
+ \ifdim\ht#1 < 0pt
+ \ht#1 = 0pt
+ \fi
+ \AdvanceBoxDimension{\dp#1}{-#2}%
+ \ifdim\dp#1 < 0pt
+ \dp#1 = 0pt
+ \fi
+}