def _row_heights2xls(self, worksheets):
        """Writes row_heights to xls file

        Format: <row>\t<tab>\t<value>\n

        """

        xls_max_rows, xls_max_tabs = self.xls_max_rows, self.xls_max_tabs

        dict_grid = self.code_array.dict_grid

        for row, tab in dict_grid.row_heights:
            if row < xls_max_rows and tab < xls_max_tabs:
                height_pixels = dict_grid.row_heights[(row, tab)]
                height_inches = height_pixels / float(get_dpi()[1])
                height_points = height_inches * 72.0

                worksheets[tab].row(row).height_mismatch = True
                worksheets[tab].row(row).height = int(height_points * 20.0)
Writes row_heights to xls file

        Format: <row>\t<tab>\t<value>\n