Fill Variable will be contoured, with color fill between contour levels. Only one variable can be chosen for filled contouring. Line Variable will be contoured. Only one variable can be chosen for line contouring. Wind Vector Wind vectors (magnitude and direction) can be plotted as arrows or as meteorological wind barbs. One or both of the 10m surface wind and the wind on one mandatory level can be plotted. Category Category variables (land-use, dominant vegetation or dominant soil) are plotted using a pre-defined color for each type.