Low signal levels on certain channels can yield highly oscillatory spectra. When these channels are excluded the spectra become non-oscillatory again.
When and why does this happen?
Why do spectra not just approach the limit as though the channel is not included in the analysis?
Is there a sensible way to implement a method which catches and mitigates this oscillatory behavior (i.e. drop a channel when the signal becomes too low at that time step)?
Low signal levels on certain channels can yield highly oscillatory spectra. When these channels are excluded the spectra become non-oscillatory again.