how to set eog channels

Hi everybody,
sorry for all these newbie's questions, but I'm really interested in
migrate all my EEGLab analysis to Mne-Python.

I'm trying to epoch my data, but the command

epochs = mne.Epochs(raw, events = events, event_id = events_ids,
        tmin = tmin, tmax = tmax, baseline = baseline, picks = picks,
preload = True, reject = dict(eeg = 80e-6, eog = 150e-6))

gives me the error:

ValueError: No EOG channel found. Cannot reject based on EOG.

and I cannot figure out how to label the EOG channels in my raw structure.

How do I do that?

Thanks for all,
Mauricio.
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set :

reject = dict(eeg = 80e-6)

and it will not complain

Alex