\warning{Page Layout 'letter'.}
\warning{}
% for canon, true left margin = \~...sidemargin + 80pt
%            true top margin = \~...topmargin + 40pt
% dimensions shrink by about 2 percent
\def\~topmargin{70pt}
\def\~twoside{F}
\def\~oddsidemargin{35pt}
\def\~headheight{12pt}
\def\~headsep{25pt}
\def\~footheight{12pt}
\def\~footsep{15pt}
\def\textheight{520pt}
\def\textwidth{375pt}
\def\~columnsep{10pt}
\def\~columnseprule{.4pt}
\vsize\textheight
\hsize\textwidth
\def\~pl~twoside{\def\~twoside{T}\def\~oddsidemargin{45pt}
    \def\~evensidemargin{25pt}}