[Eeglablist] Plot ERP functions unavailable

[Cobb Lee]

Dear all,

I am a beginner at EEGLAB and EEG research in general.

After doing all the steps (re-referencing, resampling, filtering, artifact
removal), I wanted to visualize data measures. However, the *Plot -->
Channel ERPs* , *Plot --> Channel ERP image* , etc functions are not
unavailable (they are shown gray and unclickable).

May I know if there are some important steps/procedures that we should do
before those functions would be enabled?

Thank you for your help.

CL