(a)　March 1993	(b)　August 1993
(c)　March 1994	(d)　August 1994
(e)　March 1997	(f)　August 1997
(g)　March 1998	(h)　August 1998

Fig. 4　SST in the North West Pacific Ocean

(light gray area: SST 25-26℃, dark gray area: SST 29-30℃)

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