On Sun, 16 Oct 2011, artur bala wrote: gretl's interface to gnuplot supports only a single x axis, and a single x variable. But you can write a graph specification for gnuplot that uses 2 x variables, and 2 x axes if you wish. Dump your data into a plain text file, e.g. # y1 x1 y2 x2 2 1 1000 100 4 2 800 200 6 3 600 300 8 4 400 400 10 5 200 500 and do the plot something like this: <gnuplot> set ytics nomirror set y2tics set xtics nomirror set x2tics plot 'twindata' using 1:2 axes x1y1 , \ 'twindata' using 3:4 axes x2y2 </gnuplot> Note that you have a gnuplot editor available in gretl under /File/Script files/New script/gnuplot script. Allin Cottrell