contour line label density problem

Dear NCL,
I would like to know how to solve the double shown label in figure.
I've tried to set a density is 1
but it's not changeable..

Would you know anybody about it?

http://climate.pknu.ac.kr/~jin/P-rain_d02h_06.ps

-- 
Ph. D. Student
Jin-Young Kim (jin_at_climate.pknu.ac.kr)
Integrated Climate System Modeling Lab.
Department of Environmental Atmospheric Sciences
Pukyong National University, Busan 608-737, South Korea
Web : http:climate.pknu.ac.kr/~jin
Visiting Scholar
Jin-Young Kim (Jin-Young.Kim_at_noaa.gov)
Global Systems Division
Earth System Research Laboratory
R/GSD7
325 Broadway
Boulder, CO80305-3328
+1-303- 497-4422 (Office)
+1-303- 497-7262 (FAX)

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Received on Wed Dec 10 2008 - 14:13:01 MST