[DFTB-Plus-User] the center of gate

[esi zamin]

Hello

I want to study the effect of gate on the transmission of  graphene.
The current direction is along Z
I see this example in manual:

Gate = Planar {
GateLength_l [Angstrom] = 20.0
GateLength_t [Angstrom] = 20.0
GateDistance [Angstrom] = 7.0}

I want to know the center of this gate.

Thank you
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