I'm trying to plot a Bode diagram with the `bodegraph` package, but the curve is not shown. I don't know what to do.

```
\documentclass{standalone}
\usepackage{tikz}
\usepackage{bodegraph}

\begin{document}

\begin{tikzpicture}[gnuplot def/.append style={prefix={}},xscale=7/4]
\begin{scope}[yscale=2.5/100]
\semilog{-2}{2}{-40}{60}
\BodeGraph[thin,samples=100]{-1.5:1.5}
{\POAmpAsymp{8}{0.5}+\IntAmp{1}}
\BodeGraph{-1.5:1.5}{\POAmp{8}{0.5}+\IntAmp{1}}
\end{scope}
\begin{scope}[yshift=-2cm,yscale=2.5/200]
\OrdBode{20}
\semilog{-2}{2}{-200}{0}
\BodeGraph[samples=100,thin]{-2:2}
{\POArgAsymp{8}{0.5}+\IntArg{1}}
\BodeGraph{-2:2}{\POArg{8}{0.5}+\IntArg{1}}
\end{scope}
\end{tikzpicture}

\end{document}

```

[![enter image description here](https://i.stack.imgur.com/QK4zS.png)](https://i.stack.imgur.com/QK4zS.png)