question about source space and BEM model

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Hi ! I have a question about source space and BEM model.
When I use mne.setup_source_space to get source space, I set spacing=‘oct6’ . At the same time, do I need to set ico=5 when I use mne.make_bem_model to get BEM model ? Because in the tutorial Setting up the source space , ‘oct6’ means more sources per hemisphere.

Thanks a lot!