Graphics, Figures & Tables ⇒ Additional Line at specific Point on Abscissa

[jhapk]

I am plotting some data on a log-log plot using pgfplots and getting the following figure as output.

initial.png (49.78 KiB) Viewed 3949 times

I want to add a line manually at a particular value of the x-axis to have a final output of something like this (made using Gimp).

final.png (48.43 KiB) Viewed 3949 times

How can I do this using pgfplots? My present code looks something like this.

Code: Select all

\documentclass{article}
\usepackage{pgfplots}

\begin{document}
  \begin{tikzpicture}
    \begin{loglogaxis}[
      width=10cm,height=7cm,
      title={longitudnal averages},
      **code**
      **code** 
    ]
      \addplot[
        color=brown,
        thick,
        only marks,
        mark=*,
        table/x = r
      ] table [y=u2]{l_statistics.dat};
      \addplot[
        **code**
        **code** 
        **code**
        **code** 
        **code**
        **code** 
      ]{ncl_statistics.dat};
    \end{loglogaxis}
  \end{tikzpicture}
\end{document}

[esdd]

Here is an example with an additional line at x=400:

Code: Select all

\documentclass[margin=5mm]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
  \begin{loglogaxis}[xlabel=$x$,ylabel=$y$]
    % additional line at x=400:
    \draw(current axis.south-|{axis cs:400,1})%
       --(current axis.north-|{axis cs:400,1})node[right,pos=0.7]{$x=400$};
    \addplot expression[domain=1:10000] {x^-2};
    \end{loglogaxis}
\end{tikzpicture}
\end{document}

loglogline.png (24.48 KiB) Viewed 3926 times

Regards
Elke