The plane.txt exported by Multiwfn can be directly imported into e.g. Sigmaplot to plot plane map. I doesn't have any experience in plotting plane map by gnuplot based on external plane data. The meaning of each column of plane.txt is clearly described on screen when Multiwfn exports it, you may consider to write a script to convert the format according to the requirement of the plotting tool you want to use.

I have generated the electron density along a plane using the following inputs:
4
1
2
300,300
0
5.5
2
0a
-6
-5
q

I would like to plot the corresponding plane.txt file generated by Multiwfn with gnuplot. However, the format does not seem to be compatible with the pm3d map command that I usually use for this type of plot with gnuplot.

Is there a way to plot the generated .txt output directly using gnuplot?

Thanks