%%
%% The LaTeX Companion, 3ed
%%
%% Example 7-4-7 on page I-548 in "Continuing captions across floats".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See
https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{109.80112pt}
\setcounter{page}{1}
% for the book examples we shorten the vertical spaces
\makeatletter
\renewcommand\section{\@startsection{section}{1}{\z@}%
{-1.25ex \@plus-1ex \@minus-.2ex}%
{1ex}%
{\normalfont\Large\bfseries}}
\renewcommand\section{\@startsection{section}{1}{\z@}%
{-1.25ex \@plus-1ex \@minus-.2ex}%
{.5ex}%
{\normalfont\large\bfseries}}
\makeatother
\setlength\footskip{16pt}
\pagestyle{origplain} % plain is disabled by the class
\setlength\textheight{5.4cm}
\setlength\intextsep{8pt}
\setlength\parindent{8pt} % shorten this for the example output
\usepackage{microtype} % improve line breaking
%StartShownPreambleCommands
\usepackage[labelfont={bf}]{caption}
\renewcommand\theContinuedFloat
{\alph{ContinuedFloat}}
%StopShownPreambleCommands
\begin{document}
\listoffigures \bigskip
\begin{figure}[!ht]
\ContinuedFloat* % <- star form
\centering\fbox{Figure I}
\caption{First figure}\label{FI}
\end{figure}
\begin{figure}[!ht]
\ContinuedFloat
\centering\fbox{Figure II}
\caption{Continuation}\label{FII}
\end{figure}
Figures \ref{FI} and \ref{FII} in
this example are subnumbered, while
Figure~\ref{FIII} is not. \par Use
\verb=\ContinuedFloat*= if the first
float should be labeled 1a already.
\begin{figure}
\centering\fbox{\LARGE Figure III}
\caption{Third figure}\label{FIII}
\end{figure}
\end{document}
