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  # since the order of the columns is significant, we
  # use an array to hold information about each column.
...
                     width => 200,
                     align => 'right',
                     title => 'Barque' } );

  # now we can derive whichever other hashes or arrays
  # we might want from the above data.  having a list
...

  # and to find the index of a column name:
  my %COL_INDEX; @COL_INDEX{ @COL_NAMES } = 0 .. $#COL_INFO;

  # -------------------------------------------------------
  # the information is centralized for other uses, such as
...
      }
      print "</tr>\n";
  }