undef
s1a-iw-grd-vh-20161003t175023-20161003t175048-013329-0153ff-002_filter
s1a-iw-grd-vv-20161003t175023-20161003t175048-013329-0153ff-001_filter
s1a-iw-grd-vv-20161003t175023-20161003t175048-013329-0153ff-001_winddir
s1a-iw-grd-vh-20161003t175023-20161003t175048-013329-0153ff-002_winddir