[Gnuplot-info] how to plot 2d lines on 3d picture

[Yueguang <ygx...@gm...>]

Hi, everyone:
I am doing the job to plot ion orbit in electric field. I have plotted
the electric field using following command:

gnuplot>set pm3d map
gnuplot>splot 'pro16-0-0' matrix

And, I have figured out the ion orbit, it could be plot easily by "
splot 'ion-5' with lines".
The problem is that how to plot the two pictures at the same time using
the same Coordinate. I mean plot the orbit on the electric field picture.

Thank you!

Guang Yue