[ncl-talk] nan in data radar set, how to handle

[Geeta Geeta]

HiI have the radar reflectivity at 1,2 3, km above the ground level in the NC format. 
This data ranges from lat 24.3-30.8/73.3-79.8 and 500 points both in x/y Directons. 
I have to plot this data but getting a strange plot. I looked at this dataset and has nan and -9999. in it. 
How to get rid of nan. 
I am attaching my script and data. 
Variable: reflectivity
    Type: double
    Total Size: 250000 values
                2000000 bytes
    Number of Dimensions: 4
    Dimensions and sizes:       [ 1 <time | unlimited> x 1 <nz> x 500 <ny> x 500 <nx> ]
    Chunking Info:      [ 1 <time | unlimited> x 1 <nz> x 500 <ny> x 500 <nx> ]
    Coordinates:
                time: [21.000000..21.000000]
        Number of Attributes:        5
            long_name   :       Reflectivity
            units       :       dBZ
            _FillValue  :       -9999.000000
            coordinates :       elevation azimuth range
            standard_name       :       equivalent_reflectivity_factor



 Pls Suggest how to plot this data
Geeta.
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