Hi J D, what Nizamov is true. You have to specify another file when using -A. This option puts the dielectric for example as background, but you have to specify the other file with the field (for example).
Another thing: you use z=1, z=0. Take into account that these numbers are not coordinates but the number of the slice (discreted numbers). You will have to calculate the slice using the resolution. Good luck!
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