gnuplot>f(x,y)=cos(x)*(cos(x)+cos(y*sqrt(3))) gnuplot>set contour gnuplot>show view view is 60 rot_x, 30 rot_z, 1 scale, 1 scale_z gnuplot> set view 0,90,, gnuplot> show view view is 0 rot_x, 90 rot_z, 1 scale, 1 scale_z gnuplot> replot gnuplot> splot f(x,y) w l 15 gnuplot> set xrange[-3.15:3.15] gnuplot> set yrange[-3.15:3.15] gnuplot> replot![]()