Tikz를 이용해 표에서 일정 부분을 강조하는 사각형 박스를 표현하려고 합니다. 이 때 사각형 박스를 표의 숫자 뒤로 보내려면 어떻게 해야할까요? 방법을 찾지 못해 [opacity] 옵션으로 처리했는데, 의도는 MS Office의 <레이아웃-정렬>에서 "맨 뒤로 보내기" 효과를 구현하고 싶습니다.

================

\documentclass[10pt,compress,slidetop,%
         xcolor={svgnames},% sub-package options
               xetex,
       t,
              ]{beamer}
             
\mode<presentation> % 출력 양식을 프레젠테이션으로
{
 \usetheme{Warsaw}    

 \usecolortheme[named=olive]{structure} % 색상 결정
 
  \usefonttheme[onlymath]{serif} % 수학공식에서 사용하는 글씨체
 

  \setbeamercovered{transparent} % overlay 사용
}

%==================  필요한 패키지 설정 ===============

\usepackage{amsmath, amssymb}

\usepackage{subeqnarray}

\ifxetex\else
\usepackage{graphicx}
\fi
 

\usepackage{pgfplots, pgfplotstable, gnuplottex, pgfmath}
\usepackage{tikz}
\usetikzlibrary{fit}
\usetikzlibrary{matrix}
\usetikzlibrary{positioning,arrows,shapes,calc,patterns,snakes}
\tikzstyle{every picture}+=[remember picture]

% ================== 한글 사용(한글 사용 설정의 위치에 따라 컴파일이 달라질 수 있음: 폰트 호출의 문제인 듯) =====================
\ifxetex
\usepackage[itemph]{xetexko-var}

\setmainfont[Mapping=tex-text]{Minion Pro} 
\setsansfont[Mapping=tex-text]{Myriad Pro}

\setkormainfont{휴먼명조}
\setkorsansfont{휴먼모음T}

\xetexkofontregime[cjksymbols=prevfont]{latin}
%
 \else
\usepackage{kotex}
\fi

%==============================================

%==================  Bibliography 설정===============

\usepackage%[square,
 %sort, numbers, authoryear]
 {natbib}
\def\newblock{}
\bibliography{references}

\usepackage{beamerthemesplit}
\renewcommand\refname{참고문헌}

%================================== 표 제어
\usepackage{tabulary}
\usepackage{colortbl} %각 셀에 색을 입힐 수 있음.
\usepackage{threeparttable} %참조 표시
\usepackage{booktabs} %굵은 선 표시
\usepackage{multirow}   
% \usepackage{rccol} %소수점 정렬
\usepackage{dcolumn} %소수점 정렬

%
%==================  본문 시작 ==========================
\begin{document}

% ------------------------- 슬라이드  ------------------------
\begin{frame}[shrink]
 \frametitle{test}
 
\begin{table}
\resizebox{\textwidth}{!}{
\begin{threeparttable}
\begin{tabular}{lD{.}{.}{4.4}D{.}{.}{4.4}cD{.}{.}{4.4}D{.}{.}{4.4}}
\toprule
 & \multicolumn{2}{c}{test} &  & \multicolumn{2}{c}{test}\tabularnewline
\cmidrule{2-3}\cmidrule{5-6}
 & \multicolumn{1}{c}{test}  & \multicolumn{1}{c}{test} &  & \multicolumn{1}{c}{test}  & \multicolumn{1}{c}{test}\tabularnewline
\midrule
\rowcolor{yellow!50}test0                &       0.063^{***}&      -0.005^{***}&            &       0.062^{***}&      -0.016^{***}\\
                    &     (31.58)   &    (-32.31)   &            &     (41.49)   &    (-95.28)   \\
test1           &       0.952^{***}&       0.015   &            &       0.868^{***}&      -0.025^{***}\\
                    &      (7.36)   &      (1.47)   &            &      (9.22)   &     (-2.62)   \\
test2           &       0.492^{***}&      -0.040^{***}&            &       0.717^{***}&       0.020^{***}\\
                    &      (5.03)   &     (-6.16)   &            &     (10.91)   &      (3.60)   \\
test3           &       0.227^{***}&       0.056^{***}&            &       0.257^{***}&       0.055^{***}\\
                    &      (3.37)   &     (14.21)   &            &      (4.71)   &     (14.01)   \\
test4           &       0.030   &       0.091^{***}&            &       0.145^{**} &       0.065^{***}\\
                    &      (0.38)   &     (21.61)   &            &      (2.26)   &     (14.66)   \\
상수항              &               &       3.471^{***}&            &               &       3.548^{***}\\
                    &               &    (638.02)   &            &               &    (625.15)   \\
\midrule
num0          &       \multicolumn{1}{D{,}{,}{4.4}}{1,376}   &               &            &       \multicolumn{1}{D{,}{,}{4.4}}{2,430}   &               \\
num1            &     \multicolumn{1}{D{,}{,}{4.4}}{192,739}   &     \multicolumn{1}{D{,}{,}{4.4}}{192,739}   &            &     \multicolumn{1}{D{,}{,}{4.4}}{217,206}   &     \multicolumn{1}{D{,}{,}{4.4}}{217,206}   \\
\bottomrule
\end{tabular}

\end{threeparttable}
}
\end{table}

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

\begin{tikzpicture}[remember picture, overlay, place/.style={ellipse, fill=red!20, text width=1cm}]
 \begin{pgfonlayer}{background}
 \draw[color=yellow, rounded corners, fill=yellow, opacity=90] (6.9, 3.8) rectangle (10.9, 6.4);
   \end{pgfonlayer}
\end{tikzpicture}

\end{frame}
% ------------------------------------------------------------

\end{document}
%====================  본문 끝 = ===========================