# Two different axis labels in one pgfplots graph

Is there any way in pgfplots describe the positive part of the x-axis labels above the axis and the negative part of the x-axis label below the axis? The point is that if the graph of the function is partly above and partly below the axis, thus I am not able to do that to me at least one part of labels on the axis not overwrite graph of function.

\documentclass{minimal}
\usepackage{pgfplots}
\def\AddLabel(#1,#2)#3{\node align = center at (axis cs: #1,#2) {#3};}%

\begin{document}
\begin{tikzpicture}
\def\functionlabel{\arctan\frac{\sqrt{3}\cdot x}{1-x^2}}

\begin{axis}$xmin=-10, xmax=10, domain=-9.5:9.5, ymin=-3, ymax=3, y domain=-3:3, width=\textwidth, height=0.4\textwidth, axis x line=middle, axis y line=middle, axis equal=true, xlabel=x, ylabel=y, samples=600, clip=true, xticklabel style={anchor=north,yshift=5mm}, yticklabel style={anchor=west,xshift=0.5mm},$

\addplot$line width=1.5pt,domain=-9.5:-1.01,y domain=-3:3${\function};
\addplot$line width=1.5pt,domain=-0.99:0.99, y domain=-3:3${\function};
\addplot$line width=1.5pt,domain=1.01:9.5,y domain=-3:3${\function};
\AddLabel(4,-1.5){$f\!:\ y=\functionlabel$}

\end{axis}
\end{tikzpicture}
\end{document}


You can use normal ticks for one half of the axis, and extra x ticks for the other half, and then set every extra x tick/.style={xticklabel style={anchor=north}}:

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}

\begin{axis}[
xmin=-10,
xmax=10,
domain=-9.5:9.5,
ymin=-3,
ymax=3,
y domain=-3:3,
axis x line=middle,
axis y line=middle,
axis equal image,
samples=50,
clip=true,
xticklabel style={anchor=south},
yticklabel style={anchor=west,xshift=0.5mm},
xtick={5,10},
extra x ticks={-10,-5},
every extra x tick/.style={
xticklabel style={anchor=north}
}
]