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\documentclass[10pt]{article}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[babel=true]{microtype}
\usepackage{mathpazo}
\usepackage{moreverb,amsmath,amssymb,amsthm,mathptmx,enumerate,multicol,stmaryrd,subfig,float,tabu}
\usepackage{caption}
\usepackage[demo]{graphicx}
\usepackage{booktabs,multirow,array}
\usepackage[table]{xcolor}
\usepackage{hyperref}
\hypersetup{colorlinks = true,linkcolor = blue, anchorcolor = blue, citecolor = blue, pdfstartpage=1, filecolor = red,urlcolor = red}
\usepackage[compact]{titlesec}
\definecolor{lightgray}{gray}{0.9}
\begin{document}
\begin{table}[H]
\caption{Nature of the....}
\label{tab:6}
\centering
\scriptsize\addtolength{\tabcolsep}{-2pt}
\colorbox{lightgray}{%
\begin{tabu} to .95\linewidth{X[1.2l]X[2.5l]X[1l]X[1l]X[2.5l]}
\toprule[.5pt]
{\bf bbbb} & {\bf pppp} & & {\bf Figure}& {\bf gggg}\\
\midrule[1pt]
{$m$} & {$m=0.3$} & & {\ref{Fig:Bif_Diag_disease} \subref{fig:subfig1_DP}} &{1(a)} \\
\midrule[.5pt]
& {$m< 0.3$} & {} & {\ref{Fig:Bif_Diag_disease} \subref{fig:subfig2_DP}} &{1(b)} \\
\midrule[.5pt]
& {$m \leq 0.4$} & {Yes} & {\ref{Fig:Bif_Diag_disease}\subref{fig:subfig1_DP}} &{1(a)} \\
\midrule[.5pt]
& {$m\geq 0.4$} & {No} & {\ref{Fig:Bif_Diag_disease}\subref{fig:subfig2_DP}} &{1(b)} \\
\bottomrule[.5pt]
\end{tabu}
}
\end{table}
\begin{figure}[htbp]
\centering
\subfloat[\label{fig:subfig1_DP}]{
\includegraphics[height=3cm,width=3cm]{Bif_Diag_m.eps}
}
\subfloat[\label{fig:subfig2_DP}]{
\includegraphics[height=3cm,width=3cm]{Bif_Diag_alpha.eps}
}
\caption{(Color online) (a) ..........}
\label{Fig:Bif_Diag_disease}
\end{figure}
\end{document}
\usepackage[table]{xcolor}
, but it is required in order to color the background of the table.