\documentclass[12pt,a4paper]{article}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[x=30mm, y=30mm]
  \draw[->] (-1.2, 0) -- (1.7, 0);
  \draw[->] (0, -0.7) -- (0, 1.7);
  \foreach \x in {-1, -0.5, 0.5, 1, 1.5}{
    \draw (\x, 3pt) -- (\x, -3pt) node[below]{$\scriptstyle \x$};
  }
  \foreach \y in {-0.5, 0.5, 1, 1.5}{
    \draw (3pt, \y) -- (-3pt, \y) node[left]{$\scriptstyle \y$};
  }
  \draw[dashed] (0,0) rectangle (1,1);
  \draw[color=yellow, line width=5pt] plot file{clip1.dat};
  \begin{scope}[color=red, line width=3pt]
    \input{clip1.tex}
  \end{scope}
  \draw[color=blue!10, line width=2pt] plot file{clip0.dat};
  \begin{scope}[color=blue]
    \input{clip0.tex}
  \end{scope}
\end{tikzpicture}

\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
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