\documentclass{article}%

\usepackage{tikz}


\begin{document}

\input{tiger.pgf}
% Excerpt from tiger.pgf:
%% Created by Eps2pgf 0.6.0 (build on 2008-02-04) on Fri Apr 18 08:15:18 CEST 2008
%\begin{pgfpicture}
%\pgfpathmoveto{\pgfpoint{0.6cm}{6.033cm}}
%\pgfpathlineto{\pgfpoint{20.002cm}{6.033cm}}
%\pgfpathlineto{\pgfpoint{20.002cm}{26.07cm}}
%\pgfpathlineto{\pgfpoint{0.6cm}{26.07cm}}
%\pgfpathclose
%\pgfusepath{clip}
%\begin{pgfscope}
%\definecolor{eps2pgf_color}{gray}{0.8}\pgfsetstrokecolor{eps2pgf_color}\pgfsetfillcolor{eps2pgf_color}
%\pgfpathmoveto{\pgfpoint{0.6cm}{6.033cm}}
%\pgfpathlineto{\pgfpoint{20.002cm}{6.033cm}}
%\pgfpathlineto{\pgfpoint{20.002cm}{26.07cm}}
%\pgfpathlineto{\pgfpoint{0.6cm}{26.07cm}}
%\pgfpathclose
%\pgfusepath{fill}
% ...

\input{plot.pgf}
% Excerpt from plot.pgf
% ...
%\pgfpathlineto{\pgfpoint{14.967cm}{13.811cm}}
%\pgfpathlineto{\pgfpoint{15.055cm}{14.749cm}}
%\pgfusepath{stroke}
%\end{pgfscope}
%\pgftext[x=5.134cm,y=15.013cm,rotate=90]{$y$}
%\pgftext[x=10.653cm,y=12.223cm,rotate=0]{$\theta$}
%\pgftext[x=10.656cm,y=17.45cm,rotate=0]{$\sin\theta^2$}
%\pgftext[base,left,x=8.02cm,y=14.896cm,rotate=0]{\LaTeX}
%\pgfsetdash{}{0cm}
%\pgfusepath{stroke}
%\end{pgfscope}

\end{document}