Basic of GNUPlot
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% GNUPLOT: LaTeX picture with Postscript
\begingroup
\makeatletter
\providecommand\color[2][]{%
\GenericError{(gnuplot) \space\space\space\@spaces}{%
Package color not loaded in conjunction with
terminal option `colourtext'%
}{See the gnuplot documentation for explanation.%
}{Either use 'blacktext' in gnuplot or load the package
color.sty in LaTeX.}%
\renewcommand\color[2][]{}%
}%
\providecommand\includegraphics[2][]{%
\GenericError{(gnuplot) \space\space\space\@spaces}{%
Package graphicx or graphics not loaded%
}{See the gnuplot documentation for explanation.%
}{The gnuplot epslatex terminal needs graphicx.sty or graphics.sty.}%
\renewcommand\includegraphics[2][]{}%
}%
\providecommand\rotatebox[2]{#2}%
\@ifundefined{ifGPcolor}{%
\newif\ifGPcolor
\GPcolortrue
}{}%
\@ifundefined{ifGPblacktext}{%
\newif\ifGPblacktext
\GPblacktexttrue
}{}%
% define a \g@addto@macro without @ in the name:
\let\gplgaddtomacro\g@addto@macro
% define empty templates for all commands taking text:
\gdef\gplbacktext{}%
\gdef\gplfronttext{}%
\makeatother
\ifGPblacktext
% no textcolor at all
\def\colorrgb#1{}%
\def\colorgray#1{}%
\else
% gray or color?
\ifGPcolor
\def\colorrgb#1{\color[rgb]{#1}}%
\def\colorgray#1{\color[gray]{#1}}%
\expandafter\def\csname LTw\endcsname{\color{white}}%
\expandafter\def\csname LTb\endcsname{\color{black}}%
\expandafter\def\csname LTa\endcsname{\color{black}}%
\expandafter\def\csname LT0\endcsname{\color[rgb]{1,0,0}}%
\expandafter\def\csname LT1\endcsname{\color[rgb]{0,1,0}}%
\expandafter\def\csname LT2\endcsname{\color[rgb]{0,0,1}}%
\expandafter\def\csname LT3\endcsname{\color[rgb]{1,0,1}}%
\expandafter\def\csname LT4\endcsname{\color[rgb]{0,1,1}}%
\expandafter\def\csname LT5\endcsname{\color[rgb]{1,1,0}}%
\expandafter\def\csname LT6\endcsname{\color[rgb]{0,0,0}}%
\expandafter\def\csname LT7\endcsname{\color[rgb]{1,0.3,0}}%
\expandafter\def\csname LT8\endcsname{\color[rgb]{0.5,0.5,0.5}}%
\else
% gray
\def\colorrgb#1{\color{black}}%
\def\colorgray#1{\color[gray]{#1}}%
\expandafter\def\csname LTw\endcsname{\color{white}}%
\expandafter\def\csname LTb\endcsname{\color{black}}%
\expandafter\def\csname LTa\endcsname{\color{black}}%
\expandafter\def\csname LT0\endcsname{\color{black}}%
\expandafter\def\csname LT1\endcsname{\color{black}}%
\expandafter\def\csname LT2\endcsname{\color{black}}%
\expandafter\def\csname LT3\endcsname{\color{black}}%
\expandafter\def\csname LT4\endcsname{\color{black}}%
\expandafter\def\csname LT5\endcsname{\color{black}}%
\expandafter\def\csname LT6\endcsname{\color{black}}%
\expandafter\def\csname LT7\endcsname{\color{black}}%
\expandafter\def\csname LT8\endcsname{\color{black}}%
\fi
\fi
\setlength{\unitlength}{0.0500bp}%
\ifx\gptboxheight\undefined%
\newlength{\gptboxheight}%
\newlength{\gptboxwidth}%
\newsavebox{\gptboxtext}%
\fi%
\setlength{\fboxrule}{0.5pt}%
\setlength{\fboxsep}{1pt}%
\definecolor{tbcol}{rgb}{1,1,1}%
\begin{picture}(7200.00,4320.00)%
\gplgaddtomacro\gplbacktext{%
\csname LTb\endcsname%%
\put(555,478){\makebox(0,0)[r]{\strut{}$0$}}%
\csname LTb\endcsname%%
\put(555,926){\makebox(0,0)[r]{\strut{}$0.05$}}%
\csname LTb\endcsname%%
\put(555,1374){\makebox(0,0)[r]{\strut{}$0.1$}}%
\csname LTb\endcsname%%
\put(555,1821){\makebox(0,0)[r]{\strut{}$0.15$}}%
\csname LTb\endcsname%%
\put(555,2269){\makebox(0,0)[r]{\strut{}$0.2$}}%
\csname LTb\endcsname%%
\put(555,2717){\makebox(0,0)[r]{\strut{}$0.25$}}%
\csname LTb\endcsname%%
\put(555,3165){\makebox(0,0)[r]{\strut{}$0.3$}}%
\csname LTb\endcsname%%
\put(555,3612){\makebox(0,0)[r]{\strut{}$0.35$}}%
\csname LTb\endcsname%%
\put(555,4060){\makebox(0,0)[r]{\strut{}$0.4$}}%
\csname LTb\endcsname%%
\put(656,239){\makebox(0,0){\strut{}$-4$}}%
\csname LTb\endcsname%%
\put(1434,239){\makebox(0,0){\strut{}$-3$}}%
\csname LTb\endcsname%%
\put(2211,239){\makebox(0,0){\strut{}$-2$}}%
\csname LTb\endcsname%%
\put(2989,239){\makebox(0,0){\strut{}$-1$}}%
\csname LTb\endcsname%%
\put(3766,239){\makebox(0,0){\strut{}$0$}}%
\csname LTb\endcsname%%
\put(4544,239){\makebox(0,0){\strut{}$1$}}%
\csname LTb\endcsname%%
\put(5321,239){\makebox(0,0){\strut{}$2$}}%
\csname LTb\endcsname%%
\put(6099,239){\makebox(0,0){\strut{}$3$}}%
\csname LTb\endcsname%%
\put(6876,239){\makebox(0,0){\strut{}$4$}}%
\csname LTb\endcsname%%
\put(1045,3523){\makebox(0,0)[l]{\strut{}\huge$\frac{1}{\sqrt{2\pi}\sigma}\,e^{-\frac{x^2}{2\sigma^2}}$}}%
\csname LTb\endcsname%%
\put(4505,3165){\makebox(0,0)[l]{\strut{}\Large$\sigma = 1$}}%
\csname LTb\endcsname%%
\put(5865,1374){\makebox(0,0)[l]{\strut{}\Large$\sigma = 2$}}%
}%
\gplgaddtomacro\gplfronttext{%
}%
\gplbacktext
\put(0,0){\includegraphics[width={360.00bp},height={216.00bp}]{fig3}}%
\gplfronttext
\end{picture}%
\endgroup