Once you define an observable, you can always changes its [[parameters]] later from its property dialog, which can be accessed from its right-click contextual menu. You can also delete observables.
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=== Computing Port Characteristics in FDTD ===
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Of EM.Tempo's source types, lumped sources, waveguide sources and distributed sources let you define one or more ports for your physical structure and compute its port characteristics. To do so, first you need a "Port Definition" observable in the navigation tree. One of EM.Tempo's real advantages over frequency-domain solvers is its ability of generate wideband S/Z/Y parameter data in a single simulation run.
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[[Image:Info_icon.png|40px]] Click here to learn more about '''[[Common_Excitation_Source_Types_in_EM.Cube#Exciting_Multiport_Structures_Using_Linear_Superposition | Exciting Multiport_Structures Using Linear Superposition ]]'''.
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[[Image:Info_icon.png|40px]] Click here to learn more about '''[[Data_Visualization_and_Processing#Graphing_Port_Characteristics | Graphing Port Characteristics]]'''.
[[Image:FDTD77.png|thumb|400px|Time-domain evolution of the electric field at a given point.]]