• USD/JPY continuing lower in late Asia trading, from 158.33 in New York

• Asia from 158.25 early to 157.33 EBS, through 157.46/55 lows Oct 5/15

• Towards 157.00 and 156.96 low on October 2

• Seems total $9.1 bln in option expiries today on 157 having little impact

• Another $3.1 bln below between 156.70-97 strikes

• Dealers unsure what's behind today's Asia PM move down, exporters?

• Some cite flows, perhaps from Japanese investors, others say long-paring

• Option gamma plays also cited with spot now below mega-expiries today

• Whatever the case, USD/JPY moving deeper into 155.64-158.44 daily Ichi cloud

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(Haruya Ida is a Reuters market analyst. The views expressed are his own)