\documentclass{minimal} \usepackage{filecontents,pstricks-add} \begin{filecontents*}{c_x.dat} [67,6.5] [3300,5.1] [9983,3.6] \end{filecontents*} \begin{filecontents*}{t_x.dat} [80,553] [3300,600] [9920,639] \end{filecontents*} \begin{document} \begin{pspicture}(-0.5,-0.5)(12.5,10) \psaxes[axesstyle=frame](10,8) \psaxes[axesstyle=none,Oy=540,Dy=20,dy=1.333](10,0)(10,8) \fileplot[plotstyle=dots,dotstyle=triangle*,xunit=0.001cm]{c_x.dat} \readdata{\data}{t_x.dat} \pstScalePoints(1,0.05){}{ 540 sub } % 0.05=8cm/(120*1.333) \listplot[plotstyle=line,xunit=0.001cm]{\data} \end{pspicture} \end{document}