LaTeX.org

\begin{figure}[htb]
\centering
\includegraphics[width = 4in]{Figure2b}
\caption{\label{Fig2} dummy caption.}
\end{figure}

This is the code I am using to layout my images in a paper. 5/6 are fine, but one of them always compiles with extra space (probably 15 lines) between the figure and the ...