
\def\showit#1#2{%
	\node[pin=#2:(s.#1),fill=black,circle,scale=0.3] at (current axis.#1) {};
}%
\tikzstyle{every pin}=[opacity=0.5,fill=yellow,rectangle,rounded corners=3pt,font=\tiny]
\def\showallanchors{
	\showit{north}{90}
	\showit{north west}{135}
	\showit{west}{180}
	\showit{south west}{225}
	\showit{south}{270}
	\showit{south east}{305}
	\showit{east}{0}
	\showit{north east}{45}
	\showit{center}{90}
	{\pgfplotsset{every pin/.append style={pin distance=1cm}}%
	\showit{above origin}{45}
	}%
	\showit{right of origin}{45}
	{\pgfplotsset{every pin/.append style={pin distance=1cm}}%
	\showit{below origin}{0}
	}%
	\showit{left of origin}{135}
	\showit{origin}{135}
}
\let\showanchorsafteraxis=\showallanchors
%\pgfplotsset{extra description/.append code={\showallanchors}}
\let\showanchorsafteraxis=\relax
