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A <br />b <br />s <br />• <br /> <br /> <br />Surface sad Datum <br />\.~'\ S // /~ // // <br />~ / ~ / / <br />'~. suS / ~/ / / <br />\ ~. / i / / <br />\ / / <br />~Na h , // h /~ /~/ <br />a / <br />~\ ~/ // // <br />~ / a / / <br />~~ /% `~ a~/// R - Aaale of Draw <br />/ / / b -Depth <br />S~QCrltlcel~l _- - - ~--- -_ //~_Im_ /// <br />a 1 ` m - YlninL Thlclcnasa <br />_ / <br />Crltlcal Mee _ _ <br />3upsr_CrlUcel ,tree <br />Figure 15-1 7~ouLh Subsldeace Nomeaolature (Adapted from 9ubatdence <br />EaLlneers Hnndboolc, National Coel $onrd, 1976) <br />