\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}