My data format is Nihon Kohden EDF, but only one electrode C is displayed after importing it into Brainstorm.
This is the raw data
This is the EEG data I opened using Brainstorm's EEG browser.
This is the EEG data I opened using Brainstorm's EEG browser.
You might want to check your channel file to see how the channels are allocated by type. Brainstorm groups plots by type and it might be that some have a location and some do not or that they are classified as MISC.
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Thank you very much for your help!!!