\documentclass[11pt]{article}
\usepackage[mtbold]{mathtime}
\usepackage{graphics}
\usepackage{psfrag}
\input{page}
\input{thcmac2e}

\begin{document}

\title{An Example of Using the psfrag Package} 
\author{}
\date{}

\maketitle

\noindent To produce Figure~4.3 on page~77 from CLRS, we had to use
the psfrag package.  Take a look at the same figure from the first
edition (Figure~4.3 on page~67).  The math looks horrible.
Figure~\ref{fig:master-tree} shows the same figure from the second
edition, first with psfrag in effect and then without psfrag.

\begin{figure}

\begin{center}
{
\input{master-tree.psfrag}
\includegraphics{master-tree.eps}
}
\vspace*{12ex}

\includegraphics{master-tree.eps}
\end{center}

\figcaption{Figure~4.3 with (top) and without (bottom) the
\texttt{psfrag} commands.}

\label{fig:master-tree}

\end{figure}

\medskip

Here are the \verb`\psfrag` commands that I used:

{\small
\begin{verbatim}
\psfrag{Zfn}[Bc][Bc][0.9]{$f(n)$}
\psfrag{ZfnR}[Br][Br][0.9]{$f(n)$}
\psfrag{Za}[Bc][Bc][0.9]{$a$}
\psfrag{Zfnb}[Bc][Bc][0.9]{$f(n/b)$}
\psfrag{Zfnb2}[Bc][Bc][0.9]{$f(n/b^2)$}
\psfrag{ZafnbR}[Br][Br][0.9]{$a f(n/b)$}
\psfrag{Za2fnb2R}[Br][Br][0.9]{$a^2 f(n/b^2)$}
\psfrag{Zlogbn}[Bc][Bc][0.9]{$\log_b n$}
\psfrag{Znlogba}[Bc][Bc][0.9]{$n^{\log_b a}$}
\psfrag{ZT1}[Bc][Bc][0.9]{$\Theta(1)$}
\psfrag{ZTnlogbaR}[Br][Br][0.9]{$\Theta(n^{\log_b a})$}
\psfrag{ZTotalR}[Br][Br][0.9]{Total: $\displaystyle\Theta(n^{\log_b a}) +
\sum_{j=0}^{\log_b n-1} a^j f(n/b^j)$}
\end{verbatim}
}

Things to note:
\begin{itemize}

\item Beware the admonition that the string appearing in the
PostScript file must be a single word, with no funny stuff in it.  My
convention is that I begin all text to be replaced with ``Z''\@.
There's no reason in particular that I chose ``Z'', but it has worked
well for me so far.

\item I have chosen all reference points to be on the baseline.  Some
are horizontally in the center, and some are horizontally on the
right.  In other figures, I use some reference points on the left.

\item Just to make sure I knew what was going on, I ended the name of
anything right-aligned by ``R''.

\item I have scaled the text by 0.9.  When I created the drawing in
MacDraw Pro, I used 12-point text, but I scaled it to 75\% when
creating the .eps file.  That takes it down to 9-point text.  The book
is set in 10-point, and so scaling the replacement text by 0.9 takes
it, too, down to 9-point.

\item Note the complicated replacement text for ZTotalR\@.  It
includes a summation in \verb`\displaystyle`.

\end{itemize}

There is one other thing you have to be careful about when using
psfrag.  The bounding box in your .eps file might not be the actual
bounding box of the graphic after psfrag has replaced text.  That
happened with the above file.  I had to edit the bounding box in the
.eps file to adjust it to the text that was going to be added.  The
``Zlogbn'' text changed its horizontal extent, and the ``ZtotalR''
text changed its vertical extent.

I adjusted the bounding boxes by a purely manual process.  I used gv
on the original .eps, without psfrag replacement, to create the
tentative bounding box.  Then I used gv to view the result of psfrag
replacement.  I determined the differences in text positioning and
manually adjusted the box in the .eps file.

\end{document}