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ME Scope FEA Modes calculation

Hi All,

I'm looking for some advice on the FEA | Calculate FEA Modes screen.
This has three options to fill out:
-Number of modes
-Maximum iterations
-Rigid body offset

The first is pretty obvious, the second one I can guess at, but the last one has got me baffled.

I fill this out without a real sense of what it does, except 'if it doesn't work, make the number bigger'.

What does the rigid body offset do?
When I fill in 20Hz some of the solutions are still lower than 20Hz. Does this directly affect the modes that are found?

Thanks for any insights you can offer!

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