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@@ -317,7 +317,7 @@ sub statstr {
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my $data = $_[0];
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if (defined $data->[1]) {
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my $mean = $data->[0];
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- my $stddev = sqrt($data->[1]);
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+ my $stddev = $data->[1] > 0 ? sqrt($data->[1]) : 0;
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return "$mean ± $stddev";
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} elsif (defined $data->[0]) {
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return $data->[0];
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