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 # | Season # | Title | Directed by | Written by | Original air date | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 137.0 | 1.0 | "Closure" | John Polson | Jan Nash, Bruce Ramussen | September23,2008 | 11.28 |
| 138.0 | 2.0 | "22 x 42" | Greg Walker | Byron Balasco | September30,2008 | 12.61 |
| 139.0 | 3.0 | "Last Call" | Karen Gaviola | David Amann, Byron Balasco | October14,2008 | 11.05 |
| 140.0 | 4.0 | "True/False" | Martha Mitchell | Diego Gutierrez | October21,2008 | 11.63 |
| 141.0 | 5.0 | "Rise and Fall" | Jonathan Kaplan | David Amann | October28,2008 | 12.19 |
| 142.0 | 6.0 | "Live to Regret" | John F. Showalter | Gwendolyn M. Parker | November11,2008 | 12.23 |
| 143.0 | 7.0 | "Rewind" | Karen Gaviola | Bruce Ramussen | November18,2008 | 11.85 |
| 144.0 | 8.0 | "Better Angels" | Scott White | Jan Nash, Greg Walker | November25,2008 | 10.42 |
| 145.0 | 9.0 | "Push Comes to Shove" | John F. Showalter | Diego Gutierrez, Alicia Kirk | December2,2008 | 12.32 |
| 147.0 | 11.0 | "Wanted" | Marianne Jean-Baptiste | Alicia Kirk | January6,2009 | 13.13 |
| 148.0 | 12.0 | "Believe Me" | Paul McCrane | Jan Nash, Bruce Rasmussen | January13,2009 | 12.42 |
| 150.0 | 14.0 | "Friends and Neighbors" | John F. Showalter | Amanda Segel Marks | February3,2009 | 12.16 |
| 151.0 | 15.0 | "Chameleon" | Eric Close | Byron Balasco | February10,2009 | 14.31 |
| 153.0 | 17.0 | "Voir Dire" | Jonathan C. Kaplan | Alicia Kirk | March17,2009 | 11.88 |
| 154.0 | 18.0 | "Daylight" | Jeff T. Thomas | Greg Walker, Jan Nash | March31,2009 | 12.53 |
| 155.0 | 19.0 | "Heartbeats" | Martha Mitchell | Tom Donaghy | April7,2009 | 12.15 |
| 156.0 | 20.0 | "Hard Landing" | Michael Amundson | David Rapp | April14,2009 | 13.23 |
| 157.0 | 21.0 | "Labyrinths" | Jonathan Kaplan | Diego Gutierrez, Gwendolyn M. Parker | April28,2009 | 12.35 |
| 159.0 | 23.0 | "True" | Eric Close | Alicia Kirk, Jan Nash | May12,2009 | 13.40 |
Question:
What number in the season was the episode with 12.23 million viewers?
Answer:
6.0