def unmerge_cells(self, range_string=None, start_row=None, start_column=None, end_row=None, end_column=None):
        if not range_string:
            if start_row is None or start_column is None or end_row is None or end_column is None:
                msg = "You have to provide a value either for "\
                    "'coordinate' or for 'start_row', 'start_column', 'end_row' *and* 'end_column'"
                raise InsufficientCoordinatesException(msg)
            else:
                range_string = '%s%s:%s%s' % (get_column_letter(start_column), start_row, get_column_letter(end_column), end_row)
        elif len(range_string.split(':')) != 2:
            msg = "Range must be a cell range (e.g. A1:E1)"
            raise InsufficientCoordinatesException(msg)
        else:
            range_string = range_string.replace('$', '')

        if range_string in self._merged_cells:
            self._merged_cells.remove(range_string)

        else:
            msg = 'Cell range %s not known as merged.' % range_string
            raise InsufficientCoordinatesException(msg)
Backwards compatible alias for ``HDFStore``
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/openpyxl-2.3.0-b2/openpyxl/worksheet/worksheet.py/Worksheet.unmerge_cells--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/io/pytables.py/get_store