How can i adjest the width of the JTable Header

hi all,
I have putted group header in JTable, due to this the width of the JTable and width of the column of the row is little bit variation. pleases suggest me any way to avoid it.
Thanks
Dayananda B V

TableColumn tCol = null;
        for(int i = 0; i <= 5; i++){
            tCol = tblData.getColumnModel().getColumn(i);
            if(i == 1)
                tCol.setPreferredWidth(130);
            else
                tCol.setPreferredWidth(30);
        }

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