I've been having some trouble aligning multiple figures. The problem is present with png figures and tikz figures, so I guess I am missing something.
tikz figures not properly aligned:

the particular bit of code:
\begin{figure}
\centering
\input{figs/grf_left_fb.tikz}
\input{figs/grf_fb.tikz}
\input{figs/phase_fb.tikz}
\input{figs/zap_fb.tikz}
\caption{......}
\label{fig:feedback}
\end{figure}
and with png figures (both vertical and horizontal alignment needed):

\begin{figure}
\centering
\includegraphics[scale=0.25]{figs/s1.eps}
\includegraphics[scale=0.25]{figs/s2.eps}
\includegraphics[scale=0.25]{figs/s3.eps}
\includegraphics[scale=0.25]{figs/s11.eps}
\includegraphics[scale=0.25]{figs/s28.eps}
\caption{S..........}
\label{fig:data_good_bad}
\end{figure}

\fbox{}around each figure to see where the bounding boxes are. Probably there are different amounts of white space being included. Otherwise, provide a complete Minimum Working Example people can actually compile to reproduce the problem. You can use images from themwepackage for this purpose. – cfr Sep 17 '14 at 20:49