my (undef, @col) = split /\s+/, <DATA>; # Column names
When splitting on \s+ instead of \t, the first header value, 'Amino Acid Switch Probabiities', will be wrongly split into the @col array. You need to split on tabs to prevent this from happening.

In reply to Re^2: Best way to read in an XbyX table into a Hash{Key}{Key2}[value] structure by Cristoforo
in thread Best way to read in an XbyX table into a Hash{Key}{Key2}[value] structure by ZWcarp

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