# pgfplots: node positioning

I want to place a node at the end of a curve. Since I did not find an automatic way to realize it I tried to place it manually. But the node does not appear at the expected position. It's placed near (2,12) but not (18,17.56).

Here's a MWE (Sorry for not formatting. But I have to use my smartphone for asking since StackExchange is blocked by our proxy. And this interface doesn't offer formatting options):

\documentclass{article}
\usepackage{pgfplots,pgfplotstable}
\begin{document}

Alter   P3
0   10.20
0.5 14.38
1   14.58
1.5 14.31
2   14.00
2.5 13.73
3   13.55
3.5 13.44
4   13.36
4.5 13.30
5   13.24
5.5 13.20
6   13.18
6.5 13.19
7   13.23
7.5 13.29
8   13.37
8.5 13.46
9   13.56
9.5 13.67
10  13.80
10.5    13.94
11  14.11
11.5    14.30
12  14.50
12.5    14.73
13  14.97
13.5    15.23
14  15.50
14.5    15.77
15  16.04
15.5    16.31
16  16.57
16.5    16.83
17  17.08
17.5    17.32
18  17.56
}\perzentile

\begin{tikzpicture}
\begin{axis}[%
no markers,%
]
{\perzentile};%
\node at (18,17.56) {P3};%
\end{axis}
\end{tikzpicture}
\end{document}

-

You can place nodes at the end of the plot simply by adding node {text} at the end of the \addplot command:
\addplot table[x=Alter, y=P3] {\perzentile} node {P3};

You can move the node along the plot line by using the optional [pos=<fraction>] key.
If you do want to position your node in the coordinate system manually, you should use the axis cs coordinate system:
\node at (axis cs:18,17.56) {P3};