Open
Description
Description of the problem
With evoked.plot(gfp='only')
, the ylim upper bound is not set properly, but to 1.

Steps to reproduce
Run this tutorial:
https://mne.tools/stable/auto_tutorials/evoked/30_eeg_erp.html#sphx-glr-auto-tutorials-evoked-30-eeg-erp-py
`l_aud.plot(gfp="only")`
Link to data
No response
Expected results
Something like