<!--[[Image:Info_icon.png|40px]] Click here to learn more about the various '''[[FDTD Observable Types]]'''.-->
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===Defining a New Observable===
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To create a new observable, follow these steps:
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* Right click on the name of the observable type in the '''Observables''' section of the navigation tree and select '''Insert New Observable...''' from the contextual menu. This opens up the respective Observable Dialog.
* You can change the default name of the observable as well as its color.
* Change the location of the observable, if necessary, by the changing the values of the supplied coordinate fields.
* Change the orientation of the observable, if necessary.
* In the case of frequency domain observables, change the observed frequency or frequency range, if necessary.
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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.
=== Computing Port Characteristics in FDTD ===