#proc getdata fieldnames: x y dir mag data: 1 1 0 0 2 1 0 10 3 1 0 20 4 1 0 30 5 1 0 40 6 1 0 50 7 1 0 51 8 1 0 60 #proc areadef rectangle: 1 1 4 2 xrange: 0 10 yrange: 0 2 #proc vector type: barb xfield: x yfield: y dirfield: dir magfield: mag constantlen: 0.5 // barbdir: 90