The Excel worksheet reference for the range containing the bubble sizes for *series*.
(self, series)
| 725 | return series_data |
| 726 | |
| 727 | def bubble_sizes_ref(self, series): |
| 728 | """ |
| 729 | The Excel worksheet reference for the range containing the bubble |
| 730 | sizes for *series*. |
| 731 | """ |
| 732 | return self._workbook_writer.bubble_sizes_ref(series) |
| 733 | |
| 734 | @lazyproperty |
| 735 | def _workbook_writer(self): |