undef

s1b-iw-grd-hh-20160630t174100-20160630t174125-000960-0009b9-001_filter

s1b-iw-grd-hv-20160630t174100-20160630t174125-000960-0009b9-002_filter

s1b-iw-grd-hv-20160630t174100-20160630t174125-000960-0009b9-002_winddir

s1b-iw-grd-hh-20160630t174100-20160630t174125-000960-0009b9-001_winddir