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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
}
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