The length of the vectors can be changed
with the Size combo box.
This is also an editable box, enter a new size and press return.
To avoid cluttering the display you can
define the number of grid points that are skipped
with the Skip interval combo box.
A skip interval of 0 mean show all grid values, 1 means skip every
other one, 2 means show every third one, etc.
Click on Show Streamlines to toggle between vectors and
streamlines.
When displaying as stream lines the Density slider allows you to
change the density of the display.
The color button is both the color of the selector point and the color of the vectors in the display.
Set the line width in the display. Click on the 
to change the value.
This control has an option to smooth the grid that can be used to smooth contour lines or flow fields for display. There are 6 types of smoothing: 5-point, 9-point and gaussian weighted, Cressman, circular and rectangular aperture smoothers. The amount of smoothness can be set for the gaussian smoother. The higher the amount, the smoother the grid. For the Cressman, circular and rectangular aperture, the factor is the radius in grid spacing units.
Click on the Levels box to see a pull down menu of the
native grid levels. Click on one level value to reset the
plan to that level. The plan level in use is shown
in the data's native altitude units.
The Levels box is editable. Click in the box, enter
a value and hit return to set your own value.
Click on the Cycle check box to animate
vertically through all available levels.