What it means "Channel Width 20/40/80MHz XXXX"

I have found this feature in RouterOS v. 6.42rc41 on cAP AC.

Thanks!

maybe 160Mhz channel

Or someone has forgotten to describe that channels could be defined as Ceee, eCee, eeCe, eeeC where “C” meand “main” freq and “e” means extension channel.

I am referring to this:
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