I think the TA is modelled as a chain of sensors, perhaps the more sensible in the latter part of it and perhaps not, I never bothered. OTOH when it's true that streaming 1/3 of it serves almost as well as streaming the whole would be an hint in this direction. If so, when the TA is say 1/3 below the layer and 2/3 above, in the reality I would mostly get signal from below (by say 90%?). If so yes, one better knows where the tail of is TA is
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