notes on separating upstates from downstates based on field amplitude histogram

A system transitioning between upstates and downstates should (hopefully)
exhibit a bimidal distribution in the membrane potentials of individual cells
in my networks I see also a bimodal distribution in firing rates
I want to distingquish between upstates and down states
I think that the trough between the two rate/potential peaks in the
distribution is the most logical choice
"things look better when I take the log of the rates"
so I will.
The mean is a not awful estimator but I think we can do better
sometime the peaks have different sizes and whatnot, and I'd like the fit to
not be biased by this.
parzen window approximation... might not be awful, hard to say

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