natgrid function error

Hello,

I have an error using natgrid function.

  Natgrid - two input triples have the same x/y coordinates
            but different data values:

                First triple: 152.000000 -1.356700 33.523701
                Second triple: 152.000000 -1.356700 33.481499

Could you please tell what I need to modify in the code to get rid of it?

I attached the code and the data file

-- 
regards
*******************************************************
*Alex Semenov*
*
*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks
930 Koyukuk dr, 408c3
Fairbanks, AK, USA, 99775
work phone +19074742672

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