I am writing a latex file and I have six pictures to place in one figure with three on each line. How I can do that? and how I can increase (or decrease) the space between these pictures?
\begin{figure}
\begin{center}
subfigure[\label{1a}]\includegraphics*width=0.45\textwidth]{Pic1}}
\subfigure[\label{1b}]\includegraphics*width=0.45\textwidth]{Pic2}}
\subfigure[\label{1c}]\includegraphics*width=0.45\textwidth]{Pic3}}
\subfigure[\label{1d}]{\includegraphics*width=0.45\textwidth]{Pic4}}
\subfigure[\label{1d}]{\includegraphics*width=0.45\textwidth]{Pic5}}
\subfigure[\label{1d}]{\includegraphics*width=0.45\textwidth]{Pic6}}
\caption{{}
\label{Fig1}
\end{center}
\end{figure}
I want to put the three first Pictures(Pic1,2,3) in one line and the other three (Pic 4,5,6) in another line.

\documentclass{...}on beginning, with only necessary package in preamble and ending with\end{document}, which reproduce your problem. It seems, that you use obsolete packages and your images are now 2 in the first row, 1 in the second and 3 in the last. Note, empty line in code means that you start new paragraph/row with images. – Zarko Jun 21 '17 at 06:41