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Fig. 6.
f
(
)-spectra for soils in (a) Group 1, (b) Group 2, and (c) Group 3, as shown in Fig. 4.
)-spectra for soils in (a) Group 1, (b) Group 2, and (c) Group 3, as shown in Fig. 4.)-spectra for soils in (a) Group 1, (b) Group 2, and (c) Group 3, as shown in Fig. 4.