contour with multi-values

Hello,
I am trying to plot ASCII data file in which there is 20 rows and 10 columns
.
the problem is that the first line contour is marked with several values .
i have attached the data file and the NCL script.
thanks in advance .

-- 
===============
Ahmed Lasheen
Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
Egyptian Meteorological Authority(EMA)
Cairo,Egypt
===============

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