[[Image:FDTD69.png]]
where f(t) is the temporal waveform, t<sub>0</sub> is the time delay, l<sub>0</sub> is a spatial shift, and c is the speed of light in the free space. The Fourier transform of the above temporal function evaluated at f = f<sub>0</sub> has an amplitude different than 1. For this purpose, <font color="red"><u>'''EM.Cube's [[FDTD Module]] normalizes the temporal waveform by the magnitude of its Fourier transform at the observation frequency f<sub>0</sub>.'''</u></font> As a result, a temporal plane source with any of the three waveform types will always create spectral incident source with |'''E<sup>inc</sup>'''('''r''', f<sub>0</sub>)| = 1. The temporal waveform normalization factors for the three waveform types are given below:
[[Image:FDTD70.png]]