\documentclass{book}
\usepackage{rotating}
\usepackage{tikz}
\begin{document}
This is an example This is an example This is an exampleThis is an exampleThis is an example This is an example 
This is an example This is an example This is an exampleThis is an exampleThis is an example This is an example 
This is an example This is an example This is an exampleThis is an exampleThis is an example This is an example 
This is an example This is an example This is an exampleThis is an exampleThis is an example This is an example 
\begin{tikzpicture}
\begin{scope}[ scale=2,xshift=0cm]
 % axis
\draw [-,dashed](0,-.5) -- (0,.5) node(yline)[above] {};
\draw [-,thick] (.05,-.5) to [out=90,in=-135] (.3,.2) ;
\draw [-,thick] (-.05,-.5) to [out=90,in=-50] (-.3,.2) ;
 \end{scope}
\begin{scope}[ scale=2,xshift=.15\textwidth]
 % axis
\draw [-,dashed](0,-.5) -- (0,.5) node(yline)[above] {};
\draw [-,thick] (.05,.5) to [out=90,in=-135] (.3,.2) ;
\draw [-,thick] (-.05,.5) to [out=90,in=-50] (-.3,.2) ;
 \end{scope}
\begin{scope}[ scale=2,xshift=.30\textwidth]
 % axis
\draw [-,dashed](0,-.5) -- (0,.5) node(yline)[above] {};
\draw [-,thick] (.05,.5) to [out=110,in=-145] (.3,.1) ;
\draw [-,thick] (-.05,-.5) to [out=90,in=-50] (-.3,.1) ;
 \end{scope}
\begin{scope}[ scale=2,xshift=.45\textwidth]
 % axis
\draw [-,dashed](-.5,0) -- (.5,0) node(yline)[above] {};
\draw [-,thick] (.05,.5) to [out=110,in=-145] (.3,.1) ;
\draw [-,thick] (-.05,-.5) to [out=90,in=-50] (-.3,.1) ;
 \end{scope}
\end{tikzpicture}

\end{document}