Would be interesting to see an analysis over a couple of hours in airplane mode.
I don't really understand why they only measured with the door open and then didn't test the difference with the door closed.
In either case, a good read.
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I'm fine with them measuring longer periods of time including over a day. I assume they have other work taking their attention as they are a professor, but I openly invite them or anyone else with the facilities to do the same.