\documentclass{article}
% translate with >> pdflatex -shell-escape <file>

% This file is an extract of the PGFPLOTS manual, copyright by Christian Feuersaenger.
% 
% Feel free to use it as long as you cite the pgfplots manual properly.
%
% See
%   http://pgfplots.sourceforge.net/pgfplots.pdf
% for the complete manual.
%
% Any required input files (for <plot table> or <plot file> or the table package) can be downloaded
% at
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/
% and
% http://www.ctan.org/tex-archive/graphics/pgf/contrib/pgfplots/doc/latex/plotdata/

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\pagestyle{empty}

\begin{document}
Aligning at .......
\begin{tikzpicture}[baseline]
\begin{axis}[small,anchor=aninnernode.center]
	\addplot {sin(deg(x))};
	\node
		[pin=-90:(aninnernode),fill=black,circle,scale=0.3] 
		(aninnernode) at (axis cs:-2,0.75) {};
	\draw[help lines] (axis cs:-6,0.75) -- (axis cs:6,0.75);
\end{axis}
\end{tikzpicture}
\end{document}
