$gr_waves("vwscan_00",system.U00.U00.u1.u13.vw_scan,
         "vwscan_01",system.U00.U01.u1.u13.vw_scan,
         "vwscan_10",system.U10.U00.u1.u13.vw_scan,
         "vwscan_11",system.U10.U01.u1.u13.vw_scan);

