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\documentclass[a4paper]{article}% Lars Kotthoff
\usepackage{pstricks,pst-plot,pstricks-add}
\begin{document}
\pstScalePoints(1,1){ log }{ ln } % log e y scale
\psset{xunit=3.5cm,yunit=2cm}
\begin{pspicture}(2.5,-.5)(7,-6)
\psaxes[axesstyle=frame,xticksize=0 -4.5,yticksize=0 3,%
logLines=all,subticks=10,xsubticksize=0 -4.5,ysubticksize=0 3,%
Ox=3,Oy=-1,ylogBase=e,xlogBase=10]{->}(3,-1)(6,-5.5)
\readdata{\one}{12-1.txt}
\listplot[linewidth=2pt,linecolor=red]{\one}
\readdata{\two}{12-2.txt}
\listplot[linestyle=dashed,linewidth=2pt,linecolor=blue]{\two}
\readdata{\three}{12-3.txt}
\listplot[linestyle=dotted,linewidth=2pt,linecolor=magenta]{\three}
\psframe[fillcolor=white,fillstyle=solid,framearc=.2](4.65,-2.9)(5.7,-4)
\uput[0](6,-1){$x$}
\uput[-90](3,-5.5){$f(x)$}
\psline[linecolor=red,linewidth=2pt](4.7,-3.15)(5.1,-3.15)
\rput[lc](5.4,-3.15){$f(x)=\frac{\pi(x)}{x}$}
\psline[linecolor=blue,linestyle=dashed,linewidth=2pt](4.7,-3.45)(5.1,-3.45)
\rput[lc](5.4,-3.45){$f(x)=\frac{t(x)}{x}$}
\psline[linecolor=magenta,linestyle=dotted,linewidth=2pt](4.7,-3.75)(5.1,-3.75)
\rput[lc](5.4,-3.75){$f(x)=\frac{g(x)}{x}$}
\end{pspicture}
\end{document}
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