T-S-Diagram with underlayed density contours

[nrix@xxxxxxxxxxxxxxxxxxxx]

Hi ferret users,
does anyone have an elegant solution to produce T-S diagrams 
with the corresponding density parameterspace underlayed as 
contours?

Nils

address:
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Nils H. Rix
Dept. Theor. Oceanogr.            phone: (nat.)     0-431-597-3986
Inst. f. Meereskunde                   : (int.)  ++49-431-597-3986
Duesternbrookerweg 20               fax:         ++49-431-565-876
24105 Kiel, FRG                   e-mail: nrix@ifm.uni-kiel.de 
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