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/ <br />/ <br />/ <br />/ <br />` r <br />r r <br />l Area <br />Supep— CrItloal Area <br />Figure 15 -1 Trough Subsidence Nomenclature (Adapted from Subsidence <br />Engineers Handbook. National Coal Board. 1975) <br />r <br />/ <br />/ <br />/ <br />/ <br />FA <br />a — Angle of Draw <br />h — Depth <br />m — )fining Thickness <br />