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% cat output.txt
Chr    Coord    chip_id    subarray_id    gc    NA15510
...

1    925    5730    5730_1    0.70666666    0.071
1    960    5730    5730_1    0.70333333    0.036

% cat t.pl
#!/usr/bin/perl -w
...
        return 1;
    }
}