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should read Fr = 276.5.g (rather than 268.4 g), Wz = 93 g (rather than 119 g), C~ = 1.8 pct MgC12 (rather than 1.4 pct MgCI2), and Ls = 0.34 (rather than 0.44). P~e3~ In the Nomenclature, the dimension of R[, filter resistance, should be cm-~ (rather than cm/g).doi:10.1007/bf02655186 fatcat:n7a4k6k6arh6jbxt2n5e3zusfi