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      else{
	$header_last=0;
      }
    }
  }#for x
  return join("\n",@tabout)."\n";
}

=head2 serialize

Returns a data structure as a string. See also C<Data::Dumper>
(serialize was created long time ago before Data::Dumper appeared on
CPAN, before CPAN even...)

B<Input:> One to four arguments.

First argument: A reference to the structure you want.

Second argument: (optional) The name the structure will get in the output string.
If second argument is missing or is undef or '', it will get no name in the output.

Third argument: (optional) The string that is returned is also put