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#!/pro/bin/perl

...
    $csv->print (*STDOUT, $row);
    }
close $fh;

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# cat data.csv
CSFDATVM01,,2.55,3.77
...
Argument "" isn't numeric in subroutine entry at xx.pl line 17, <$fh> 
+line 1.
CSFDATVM01,0,2.55,3.77
#