field 3d 3vector real uniform
dimension 25 25 40
variable1 file=/usr/ncsa/vortex/3d.data skip=0 filetype=ascii
variable2 file=/usr/ncsa/vortex/3d.data skip=3125 filetype=ascii
variable3 file=/usr/ncsa/vortex/3d.data skip=6250 filetype=ascii