% afmetingen A4: 21.02241038 cm x 29.73017788 cm
% center usable area on paper
\hsize175mm \vsize260mm
\hoffset0pt \voffset0pt
\advance\hoffset by 21.02241038cm \advance\voffset by 29.73017788cm
\advance\hoffset -\hsize \advance\voffset -\vsize
\divide\hoffset by 2 \divide\voffset by 2
\advance\hoffset by -1in \advance\voffset by -1in
