\noindent
\begin{center}
\begin{tabular}{|l|c|l|}
\hline
\multicolumn{3}{|c|}{{\vrule height12pt width0pt depth3.5pt\Large
MM Macros Supported con't}}\\ 
\hline\hline
macro&	 supported&\multicolumn{1}{|c|}{description}\\
\hline
.ML&	x&		marked-list\\
.MT&	x&		document-type\\
.ND&	x&		new-date\\
.NE&	x&		notation-end\\
.nP&	&		double-line-indent-paragraphs\\
.NS&	x&		notation-start\\
.OF&	&		odd-page-footer\\
.OH&	&		odd-page-header\\
.OK&	x&		keyword-spec\\
.OP&	&		odd-page\\
.P&	x&		paragraph-start\\
.PE&	&		picture-end\\
.PF&	&		flyback-picture-end\\
.PF&	&		main-page-footer\\
.PH&	&		main-page-header\\
.PM&	x&		proprietary-marking\\
.PS&	x&		picture-start\\
.R&	p&		change-to-roman\\
.RB&	&		roman-bold\\
.RD&	&		interactively-insert-text\\
.RF&	x&		reference-end\\
.RI&	&		roman-italic\\
.RL&	&		reference-list\\
.RP&	&		produce-reference-page\\
.RS&	x&		reference-start\\
.S&	&		change-point-size\\
.SA&	&		right-justify\\
.SG&	x&		signature\\
.SK&	x&		skip-page\\
.SM&	&		make-string-smaller\\
.SP&	x&		vertical-space\\
.TB&	x&		table-caption\\
.TC&	x&		table-of-contents\\
.TE&	?&		table-end\\
.TH&	&		multi-page-table-header\\
.TL&	x&		document-title\\
.TM&	x&		technical-memo-number\\
.TS&	?&		table-start\\
.VL&	x&		variable-mark-list\\
.VM&	&		vertical-margin\\
.WC&	&		two-column-style\\
\hline
\hline
x&\multicolumn{2}{|l|}{implemented}\\
p&\multicolumn{2}{|l|}{partially implemented; not all options available}\\
?&\multicolumn{2}{|l|}{implemented but effect is not fully standard}\\
\hline
\end{tabular}\end{center}
\medskip