使用带有 gnuplot 和 tikz 装饰的 pgfplots 时尺寸太大

Question

我使用以下代码（使用 MikTeX 最新版本和 GNUplot 5.4.8）来绘制参数图：

\documentclass{article}
\usepackage[dvipsnames, svgnames, table]{xcolor}
\usepackage{pgfplots}
\usepackage{tikz}
\usetikzlibrary{% tikz
    arrows.meta,
    decorations,
    decorations.pathreplacing,
    decorations.markings
}
\usepgfplotslibrary{
    fillbetween
}

\begin{document}

\begin{tikzpicture}
\begin{axis}
[% settings
    name=plot1,
    axis background/.style={
        fill=LightBlue!20, opacity=0.75
    },
%   no marks,
%   axis on top=true, 
    axis x line=middle, 
    axis y line=middle,
    axis equal image,
    x axis line style={
        Gray,
        line cap = round,
       -Latex[round]
    },
%    xticklabel=\empty,
%    x tick style = {
%        {draw=none}
%    },
    y axis line style={
        Gray,
        line cap = round,
       -Latex[round]
    },
%    yticklabel=\empty,
%    y tick style = {
%       {draw=none}
%    },
    restrict x to domain=-10:10,
    restrict y to domain=-10:10,
    xmin= -5, xmax=+5,
    ymin= -5, ymax=+5,
    smooth,
    grid=both,
    major grid style={line width=.2pt,draw=gray!50},
    minor grid style={line width=.1pt,draw=gray!50},
    minor tick num=4
]
\foreach \a/\b in {4/7,9/13}{
    \addplot[
        postaction={
            decoration={markings,
                mark=at position 0.68 with {\arrow{Latex[round,scale=2]}}
            },
             decorate
        },
        line cap=round,
    ] gnuplot [raw gnuplot] {
    set parametric;
    plot 
    -1*(\a)*exp(4*t)+(\b)*exp(4*t), 
    -1*(\a)*exp(4*t)+(\b)*exp(4*t)*t+
                  .5*(\b)*exp(4*t);
    };
    \addplot[
        postaction={
            decoration={markings,
                mark=at position 0.7 with {\arrow{Latex[round,scale=2]}}
            },
            decorate
        },
        line cap=round,
    ] gnuplot [raw gnuplot] {
    set parametric;
    plot 
    -1*(-\a)*exp(4*t)+(-\b)*exp(4*t), 
    -1*(-\a)*exp(4*t)+(-\b)*exp(4*t)*t+
                   .5*(-\b)*exp(4*t);
    };
}
\addplot[
    postaction={decorate},
    decoration={markings,
        mark=at position 0.9 with {\arrow{Latex[round,scale=2]}}
    },
    densely dashed, line cap=round
] {x};
\addplot[
    postaction={decorate},
    decoration={markings,
        mark=at position 0.1 with {\arrowreversed{Latex[round,scale=2]}}
    },
    densely dashed, line cap=round
] {x};
\end{axis}
\end{tikzpicture}

\end{document}

然而 TeX 抱怨：“尺寸太大”。我试过了

• 移除密钥smooth

• 调整标记位置

• 使用 wsl 上的 TeXLive 2023 进行编译

但仍然没有进展。

我现在考虑使用渐近线来做参数图，但是在使用渐近线时如何指定 x 和 y 的定义域？