\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usepackage{pgfplots}
\usepackage[dvips]{graphics}
\usepackage{cmap}
\usepackage{epsfig, graphicx, euscript}
\usepackage{epstopdf}
\begin{document}
\begin{figure}[h]
\begin{center}
\includegraphics{post.eps}
\quad\mbox{}
\end{center}
\vspace{-7mm}
\caption{elliptical paraboloid}
\label{freq_dist}
\end{figure}
\end{document}