extract montage from raw (ecog data)

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Hi everyone,

How can I retrieve a sensor montage that has already been imported in a raw object without having to read any sensor location file ? like a raw.get_montage() for instance (sorry for this probably stupid question..)
I?ve been trying with things like raw.info[?dig?] but then I could not manage to combine digpoints so as to build up a montage object.
(I?m working with ECoG data)

Thanks for your help!