Why are there two center frequencies?

There are two center frequencies (MELBOURNE CENTER) but I can’t log in to any of the two even though I am above 18000ft. And even if I could, how would I know which one to connect to?
Thanks!

Click on the FIR. You’ll be able to see the distance you are from where each freq is being omitted. If you’re >270nm away from one, you can’t contact it.

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Oh okay, I thought that once a controller in on center, the whole area of the center would be controlled. Thanks!

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