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Table 16-q Seismic Coefficient Ca, Zone 4.

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I have a question in regard to Table 16-Q ('97 UBC) for the seismic coefficient Ca.
For Zone 4, in going from soil type Sd to Se, why does the coeff. drop from 0.44*Na to 0.36*Na?
Jeffrey T. Flansburg, EIT
John W. Parkin Engineering
500 Washington St.
Vancouver, WA  98660
(360) 694-8378 ext. 104
(360) 694-3376 fax