if (!defined $data{$curr_identifier}[2]){
            $output1= "no height for both markers- failed";
 } else {
    if ($data{$curr_identifier}[2] eq " ") {
        $output1 = $markername;

    } 
 }
 
 print $curr_identifier, $output1 . "\t" . $output1 . "\n";