\noindent
\begin{center}
\begin{tabular}{|l|c|l|}
\hline
\multicolumn{3}{|c|}{{\vrule height12pt width0pt depth3.5pt\Large
MM Number Registers Supported}}\\ 
\hline\hline
register&	 supported&\multicolumn{1}{|c|}{description}\\
\hline
A&	&	preprinted forms\\
Au&	&	inhibits printing of author data\\
C&	&	copy type (original, draft, ...)\\
Cl&	&	heading level in table-of-contents\\
Cp&	&	placement of list of figures\\
D&	&	debug\\
De&	&	display eject\\
Df&	&	display format\\ 
Ds&	&	static display space\\
E&	&	font of Subject/Date/From fields\\
Ec&	&	equation counter\\
Ej&	&		page-ejection flag for headings\\
Eq&	&		equation label placement\\
Ex&	&		exhibit counter\\
Fg&	x&	figure counter\\
Fs&	&		footnote-space\\
H1-H7&	&		Heading counters\\
Hb&	&		heading break level\\
Hc&	&		heading centering level\\
Hi&	&		heading temporary indent\\
Hs&	&		heading space level\\
Ht&	&		heading type\\
Hu&	&		heading level for unnumbered heading\\
Hy&	&		hyphenation control\\
L&	&		page length\\
Le&	&		list of equations\\
Lf&	&		list of figures\\
Li&	&		list indent\\
Ls&	&		list spacing between items list\\
Lt&	&		list of tables\\
Lx&	&		list of exhibits\\
N&	&		numbering style\\
Np&	&		numbering style for paragraphs\\
O&	&		offset of page\\
Oc&	&		table of contents page numbering style\\
Of&	&		figure caption style\\
P&	&		page number\\
Pi&	&		paragraph indent\\
Ps&	&		paragraph spacing\\
Pt&	&		paragraph type\\
Pv&	&		Private header\\
Rf&	x&		reference counter\\
S&	&		default point size\\
Si&	&		standard indent for displays\\
T&	&		nroff output device\\
Tb&	x&		table counter\\
U&	&		underlining style (nroff)\\
W&	&		page width\\
\hline\hline
x&\multicolumn{2}{|l|}{implemented}\\
\hline
\end{tabular}
\end{center}
\medskip