undef

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s1a-ew-grd-vh-20160920t201434-20160920t201538-013141-014dfa-002_filter

s1a-ew-grd-vh-20160920t201434-20160920t201538-013141-014dfa-002_winddir

s1a-ew-grd-vv-20160920t201434-20160920t201538-013141-014dfa-001_winddir