Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Series # | Episode title | Writer(s) | Director | U.S. viewers (millions) | Original air date |
| --- | --- | --- | --- | --- | --- |
| 1.0 | " Pilot " | Silvio Horta | Richard Shepard | 16.32 | September28,2006 |
| 2.0 | " The Box and the Bunny " | Silvio Horta | Sheree Folkson | 14.26 | October5,2006 |
| 3.0 | " Queens for a Day " | Marco Pennette | James Hayman | 13.95 | October12,2006 |
| 4.0 | " Fey's Sleigh Ride " | Sheila Lawrence | Tricia Brock | 13.17 | October19,2006 |
| 5.0 | " The Lyin', the Watch and the Wardrobe " | Donald Todd | Rodman Flender | 13.14 | October26,2006 |
| 6.0 | " Trust, Lust, and Must " | Cameron Litvack | Jamie Babbit | 13.62 | November2,2006 |
| 7.0 | " After Hours " | Dailyn Rodriguez | James Hayman | 12.81 | November9,2006 |
| 8.0 | " Four Thanksgivings and a Funeral " | Marco Pennette | Sarah Pia Anderson | 12.95 | November16,2006 |
| 9.0 | " Lose the Boss " | Oliver Goldstick | Ken Whittingham | 8.74 | November23,2006 |
| 10.0 | " Fake Plastic Snow " | Veronica Becker & Sarah Kucserka | James Hayman | 13.02 | November30,2006 |
| 11.0 | " Swag " | James D. Parriott | Tamra Davis | 11.65 | January4,2007 |
| 12.0 | " Sofia's Choice " | Silvio Horta | James Hayman | 13.49 | January11,2007 |
| 13.0 | " In or Out " | Myra Jo Martino | Michael Spiller | 14.10 | January18,2007 |
| 14.0 | " I'm Coming Out " | James D. Parriott | Wendey Stanzler | 14.00 | February1,2007 |
| 15.0 | " Brothers " | Shelia Lawrence | Lev L. Spiro | 14.27 | February8,2007 |
| 16.0 | " Derailed " | Cameron Litvack | James Hayman | 13.66 | February15,2007 |
| 17.0 | " Icing on the Cake " | Dailyn Rodriguez | Jeff Melman | 10.80 | March15,2007 |
| 18.0 | " Don't Ask, Don't Tell " | Sarah Kucserka, Veronica Becker & Marco Pennette | Tricia Brock | 10.41 | March22,2007 |
| 19.0 | " Punch Out " | Oliver Goldstick | Miguel Arteta | 9.46 | April19,2007 |
| 20.0 | " Petra-Gate " | Harry Werksman & Gabrielle Stanton | Paul Lazarus | 9.62 | April26,2007 |
| 21.0 | " Secretaries' Day " | Henry Alonso Myers | Victor Nelli, Jr. | 10.68 | May3,2007 |
| 22.0 | " A Tree Grows in Guadalajara " | Tracy Poust & Jon Kinnally | Lev L. Spiro | 9.63 | May10,2007 |
Question:
When did Shelia Lawrence join the series?
Answer:
15.0