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A '''Lumped Source ''' is the most commonly used way of exciting a structure in EM.Cube's [[FDTD Module]]. A lumped source acts as a voltage source in series with an internal resistance that is placed between two adjacent mesh grid nodes on a line object. The line object must be parallel to one of the three principal axes.  {{Note|In order to create a lumped source, you must have at least one line object in the project workspace.}}