, with the contents of four lines changed to

x1= 60     ; Leftmost  grid point to depict, for dimension  x  or  lon
x2= 80     ; Rightmost grid point to depict
y1= 85     ; Lowermost grid point to depict, for dimension  y  or  lat
y2= 105    ; Uppermost grid point to depict

in order to zoom in on a sub-domain.


Example 3:
Salinity

Then, a figure was made by issuing the command

contour.sh 4dmap hycom_031_TS.nc salin 6 1

The figure above does not contain a lot of information. This shows that NCL's automatic contouring capability can fall short of the user's requirements. Such a circumstance typically arise when the field to be displayed contains outliers. In this example, salty waters exist south of the tip of Florida. Thus:


Example 4:
As Example 3, but with more contours and colors

The figure below was made by issuing the same command as in Example 3, after the file userdef.ncl was copied from