Subfloat labels don't display properly

Question

The screenshot has the bottom part of a figure with two subfigures. As you can see, the labels have a very narrow width. I don't understand why.

\begin{figure}[htp]
  \centering
  \subfloat[Frequency Histogram]{}\includegraphics[width=2.75in,height=2.5in]{left-figure}
  \subfloat[Boxplots]{}\includegraphics[width=2.75in]{right-figure}
  \caption{The caption of the entire figure which displays fine but not shown here} 
  \label{whatever}
\end{figure}

What I am trying to achieve is the same layout as in this wikibook page (where the subfigure text fits on a line under each image).

Thanks ahead for the advice.

Answer 1

The layout is correct for the code you are using! i.e.

1. centering
2. Empty subfloat with a "subcaption"
3. graphic
4. Empty subfloat with a "subcaption"
5. graphic
6. caption

Anything that you want to appear as a subfloat needs to be enclosed in the

\subfloat[Optional TOC caption][Sub-caption]{subfloat body}

So for your example try ths:

\begin{figure}[htp]
  \centering
  \subfloat[Frequency Histogram]{\includegraphics[width=2.75in,height=2.5in]{left-figure}}
  \subfloat[Boxplots]{\includegraphics[width=2.75in]{right-figure}}
  \caption{The caption of the entire figure which displays fine but not shown here} 
  \label{whatever}
\end{figure}

This results in:

1. centering
2. Subfloat with a "subcaption"
   1. contents graphic
3. Subfloat with a "subcaption"
   1. contents graphic
4. caption

NB!

\subfloat { body } % correct
\subfloat {} body  % wrong

For more info & more examples see:

$texdoc subfig