Interval Specify a contour interval. Minimum Specify the minimum contour level. Maximum Specify the maximum contour level. Color(s) Choose a color table for color fill, or a color for contour lines or vectors. Ref. Length Specify the relative length (0.0-1.0) of the reference vector. Magnitude Specify the magnitude (wind speed) associated with the refernce vector. Land/water mask Turn on (or off) masking of parameter(s) over oceans. Output type Choose output format [PNG (portable network graphic) or PDF (Adobe portable document format)] for map (either type can be saved with right-click).