Fusion 360 - Mesh Refinement

[flyntm 2]

I've recently started using Fusion 360 and I'm wondering about the "Mesh Refinement" setting when I'm exporting a file for printing through Cura on a UM3. 

Under the "Save as Mesh" command, I select STL and Millimeters and then there's several "Refinement" settings. There's the basic HIGH, MEDIUM, and LOW setting, plus a CUSTOM setting which lets you adjust 4 different "Refinement Options".

 

Does anyone have any understanding and or suggestions as to how these settings affect Cura and the finished 3D print?

 

Thanks for your help.