\outer\def\unnumberedsubsec{\parsearg\unnumberedsubsecyyy}
\def\unnumberedsubsecyyy #1{\unnmhead2{#1}} %normally calls unnumberedsubseczzz
\def\unnumberedsubseczzz #1{\seccheck{unnumberedsubsec}%
-\plainsecheading {#1}\gdef\thissection{#1}%
+\plainsubsecheading {#1}\gdef\thissection{#1}%
{\chapternofonts%
\edef\temp{{\realbackslash unnumbsubsecentry{#1}{\noexpand\folio}}}%
\escapechar=`\\%
\outer\def\unnumberedsubsubsec{\parsearg\unnumberedsubsubsecyyy}
\def\unnumberedsubsubsecyyy #1{\unnmhead3{#1}} %normally unnumberedsubsubseczzz
\def\unnumberedsubsubseczzz #1{\seccheck{unnumberedsubsubsec}%
-\plainsecheading {#1}\gdef\thissection{#1}%
+\plainsubsubsecheading {#1}\gdef\thissection{#1}%
{\chapternofonts%
\edef\temp{{\realbackslash unnumbsubsubsecentry{#1}{\noexpand\folio}}}%
\escapechar=`\\%
\parindent=0pt\raggedright
\rm #1\hfill}}\bigskip \par\penalty 200}
-\def\heading{\parsearg\secheadingi}
-
-\def\subheading{\parsearg\subsecheadingi}
-
-\def\subsubheading{\parsearg\subsubsecheadingi}
+% @heading, @subheading, @subsubheading.
+\def\heading{\parsearg\plainsecheading}
+\def\subheading{\parsearg\plainsubsecheading}
+\def\subsubheading{\parsearg\plainsubsubsecheading}
% These macros generate a chapter, section, etc. heading only
% (including whitespace, linebreaking, etc. around it),
\newskip \subsecheadingskip \subsecheadingskip = 17pt plus 8pt minus 4pt
\def\subsecheadingbreak{\dobreak \subsecheadingskip {-500}}
\def\subsecheading#1#2#3#4{\sectionheading{subsec}{#2.#3.#4}{#1}}
+\def\plainsubsecheading#1{\sectionheading{subsec}{}{#1}}
% Subsubsection titles.
\let\subsubsecheadingskip = \subsecheadingskip
\let\subsubsecheadingbreak = \subsecheadingbreak
\def\subsubsecheading#1#2#3#4#5{\sectionheading{subsubsec}{#2.#3.#4.#5}{#1}}
+\def\plainsubsubsecheading#1{\sectionheading{subsubsec}{}{#1}}
% Print any size section title.