A Difference between free G-action and effective G-action?

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What is the difference between an effective G-action on a manifold and a free G-action on a manifold? Including a screenshot of the page from Isham where they are defined. Seem to be the same thing to me. Maybe I'm just not seeing the difference?
 

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Oops. Never mind. I got it. Don't see an option for deleting the thread.
 

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