如何在表格中使用聚集而不导致附近列的多余空间？

Question

我希望某个电路的电路布局和数学方程式能与相关标题并列。我为此使用了一个表格，因为我将来可能还会添加一些信息。下面是表格：

\documentclass[a4paper]{book}
    \usepackage[margin=2cm]{geometry} % I use 2 cm to save space.
    \usepackage{mathtools}
    \usepackage{array} % For fixed length columns in tabular environments
    \usepackage{ragged2e} % To better align fixed length columns to the left. See: https://tex.stackexchange.com/a/7375
\begin{document}
    \paragraph{Common Source Stage with Resistive Load}\ \\
    \begin{tabular}{cc}
        \includegraphics[scale=0.3]{commonSourceWithRLoad} &
        $\begin{gathered}
            I_D = \begin{cases}
                \mu_n C_\text{ox}\frac{W}{L} \left[ \left(V_\text{GS} - V_{\rm th}\right)V_\text{DS} - \frac{{V_\text{DS}}^2}{2} \right] (1 + \lambda V_{DS}) & , \text{triode}\\
                \frac{1}{2}\mu_n C_\text{ox}\frac{W}{L}\left(V_\text{GS} - V_\text{th}\right)^2(1 + \lambda V_{DS}) & , \text{saturation}\\
                I_\text{0} e^\frac{V_\text{GS}}{nV_\text{T}} & , \text{inversion}
            \end{cases}\\
            V_{DS}=V_{DD}-R_D I_D\\
            V_{GS} = V_{in}
        \end{gathered}$ \\
        Circuit Diagram & Mathematical Model
    \end{tabular}
\end{document}

结果有一些多余的空白，我该如何摆脱它？图片本身几乎没有空白，所以这不是问题。

Answer 1

同时我想出了一个使用tabularray包的替代解决方案：

\documentclass[a4paper]{book}
\usepackage[margin=2cm]{geometry} % I use 2 cm to save space.
\usepackage{mathtools}
\usepackage{tabularray} % version 2021P or newer
\usepackage[demo]{graphicx}

\begin{document}
\paragraph{Common Source Stage with Resistive Load}\    \\

\noindent\begin{tblr}{colspec={@{} c  X[b, c] @{}},
                 rowsep=3pt}
\includegraphics[scale=0.3]{commonSourceWithRLoad} 
    &   \SetCell[c=1]{l}
        {$I_D = \begin{dcases*}
            \mu_n C_\text{ox}\frac{W}{L} \left[ \left(V_\text{GS} - V_{\rm th}\right)V_\text{DS} - \frac{{V_\text{DS}}^2}{2} \right] (1 + \lambda V_{DS}) 
                & ,     triode  \\
                \frac{1}{2}\mu_n C_\text{ox}\frac{W}{L}\left(V_\text{GS} - V_\text{th}\right)^2(1 + \lambda V_{DS}) & , \text{saturation}\\
            I_\text{0} e^\frac{V_\text{GS}}{nV_\text{T}} 
                    & , inversion   
                \end{dcases*} $ \\[2ex]
            $V_{DS}=V_{DD}-R_D I_D, \qquad  V_{GS} = V_{in}$ \\   
        }  \\
Circuit Diagram 
    &   Mathematical Model
    \end{tblr}
\end{document}