I think that there is a bug in the definition of the
afourwide macro:
% Use @afourwide to print on European A4 paper in wide format.
\def\afourwide{\afourpaper
\changepagesizes{9.5in}{6.5in}{\hoffset}{\normaloffset}{\bindingoffset}{7mm}}
It should be:
% Use @afourwide to print on European A4 paper in wide format.
\def\afourwide{\afourpaper
\changepagesizes{6.5in}{9.5in}{\hoffset}{\normaloffset}{\bindingoffset}{7mm}}
(note that the vsize and hsize parameters have been inverted)
Pascal.
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