# Split on multiple spaces using regex captured matches
        my @temp_and_starts = $_                              =~ /[^\s]+/g;
        my @last_AT_fracs   = <$in>                           =~ /[^\s]+/g;
        my @twenty_SFs      = (<$in> . <$in> . <$in> . <$in>) =~ /[^\s]+/g;