dcl_VelX_tz-contour001.gif:b:t=0-1080000
dcl_VelX_tz-contour002.gif:b:t=1080000-2160000
dcl_VelX_tz-contour003.gif:b:t=2160000-3240000
dcl_VelX_tz-contour004.gif:b:t=3240000-4320000