\documentclass[14pt]{report}
\usepackage{extsizes}
\usepackage[paperwidth=21cm,paperheight=21cm,left=0.2cm,right=0.2cm,top=0.2cm,bottom=0.2cm]{geometry}
\usepackage{pxfonts}
\pagestyle{empty}
\usepackage{graphicx}
\usepackage{booktabs}
\usepackage[table]{xcolor}
\definecolor{lightgray}{gray}{0.85}
\usepackage{color}
\begin{document}
\begin{table}
  \begin{center}
  \rowcolors{2}{lightgray}{}
  \resizebox*{0.8\textwidth}{!}{
    \begin{tabular}{lp{4.45cm}p{4.45cm}}
      \toprule
 Parameter   & . rsFixed output SAVE & . rsFree output SAVE  \\ 
      \midrule
  'Adbar' & $0.1561 \pm 0.0090$& $0.1483 \pm 0.0090$  \\ 
  'Adv' & $\textcolor{blue}{ 1.0000 }$& $\textcolor{blue}{ 1.0000 }$  \\ 
  'Ag' & $\textcolor{blue}{ 1.0000 }$& $\textcolor{blue}{ 1.0000 }$  \\ 
  'Agp' & $0.489 \pm 0.055$& $0.373 \pm 0.055$  \\ 
  'Auv' & $\textcolor{blue}{ 1.0000 }$& $\textcolor{blue}{ 1.0000 }$  \\ 
  'Bdbar' & $-0.1379 \pm 0.0095$& $-0.1231 \pm 0.0095$  \\ 
  'Bdv' & $0.841 \pm 0.045$& $0.891 \pm 0.045$  \\ 
  'Bg' & $-0.502 \pm 0.081$& $-0.492 \pm 0.081$  \\ 
  'Bgp' & $-0.555 \pm 0.054$& $-0.571 \pm 0.054$  \\ 
  'Buv' & $0.771 \pm 0.014$& $0.786 \pm 0.014$  \\ 
  'Cdbar' & $6.9 \pm 1.6$& $11.7 \pm 1.6$  \\ 
  'Cdv' & $4.26 \pm 0.26$& $4.25 \pm 0.26$  \\ 
  'Cg' & $3.63 \pm 0.60$& $3.31 \pm 0.60$  \\ 
  'Cgp' & $\textcolor{blue}{ 25.00 }$& $\textcolor{blue}{ 25.00 }$  \\ 
  'Cstr' & $6.18 \pm 0.82$& $7.31 \pm 0.82$  \\ 
  'Cubar' & $5.68 \pm 0.47$& $5.44 \pm 0.47$  \\ 
  'Cuv' & $4.889 \pm 0.074$& $4.804 \pm 0.074$  \\ 
  'Euv' & $11.79 \pm 0.84$& $9.83 \pm 0.84$  \\ 
  'rs' & $\textcolor{blue}{ 0.5000 }$& $1.10 \pm 0.15$  \\ 
      \midrule
  \rowcolor{white}
 Fit status   & \textcolor{red}{ not-a-fit } & \textcolor{red}{ not-a-fit }  \\ 
  \rowcolor{white}
 Uncertainties   & not-a-fit & not-a-fit  \\ 
      \bottomrule
    \end{tabular}
  }
  \end{center}
\end{table}

\end{document}
