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:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 131.0 | 1.0 | "4:30 AM (Apparently They Were Traveling Abroad)" | Clark Mathis | Mark Schwahn | September14,2009 | 3X5301 | 2.55 |
| 132.0 | 2.0 | "What Are You Willing to Lose" | Les Butler | Mark Schwahn | September21,2009 | 3X5302 | 2.30 |
| 133.0 | 3.0 | "Hold My Hand as I'm Lowered" | Liz Friedlander | Mark Schwahn | September28,2009 | 3X5303 | 2.51 |
| 134.0 | 4.0 | "Believe Me, I'm Lying" | Greg Prange | John A. Norris | October5,2009 | 3X5304 | 2.13 |
| 135.0 | 5.0 | "Your Cheatin' Heart" | Peter B. Kowalski | Mike Herro & David Strauss | October12,2009 | 3X5305 | 2.55 |
| 136.0 | 6.0 | "Deep Ocean Vast Sea" | Janice Cooke | Mike Daniels | October19,2009 | 3X5306 | 2.21 |
| 137.0 | 7.0 | "I and Love and You" | James Lafferty | Mark Schwahn | October26,2009 | 3X5307 | 2.67 |
| 138.0 | 8.0 | "(I Just) Died in Your Arms Tonight" | Michael J. Leone | Terrence Coli | November2,2009 | 3X5308 | 2.32 |
| 139.0 | 9.0 | "Now You Lift Your Eyes to the Sun" | Sophia Bush | Karen Gist | November9,2009 | 3X5309 | 2.67 |
| 140.0 | 10.0 | "You Are a Runner and I Am My Father's Son" | Paul Johansson | Mark Schwahn | November16,2009 | 3X5310 | 2.63 |
| 141.0 | 11.0 | "You Know I Love You... Don't You?" | Greg Prange | William H. Brown | November30,2009 | 3X5311 | 2.40 |
| 142.0 | 12.0 | "Some Roads Lead Nowhere" | Mark Schwahn | Mark Schwahn | December7,2009 | 3X5312 | 2.57 |
| 143.0 | 13.0 | "Weeks Go by Like Days" | Joe Davola | Karin Gist | January18,2010 | 3X5313 | 2.18 |
| 144.0 | 14.0 | "Family Affair" | Paul Johansson | Mike Herro and David Strauss | January25,2010 | 3X5314 | 2.20 |
| 145.0 | 15.0 | "Don't You Forget About Me" | Les Butler | Terrence Coli | February1,2010 | 3X5315 | 2.15 |
| 146.0 | 16.0 | "My Attendance Is Bad But My Intentions Are Good" | Jessica Landaw | Nikki Schiefelbein | February8,2010 | 3X5316 | 2.17 |
| 147.0 | 17.0 | "At the Bottom of Everything" | Bethany Joy Galeotti | John A. Norris | February15,2010 | 3X5317 | 1.87 |
| 148.0 | 18.0 | "The Last Day of Our Acquaintance" | Joe Davola | Mike Daniels | February22,2010 | 3X5318 | 2.23 |
| 149.0 | 19.0 | "Every Picture Tells a Story" | Chad Graves | William H. Brown | April26,2010 | 3X5319 | 2.01 |
| 150.0 | 20.0 | "Learning to Fall" | Greg Prange | Shaina Fewell and Renee Intlekofer | May3,2010 | 3X5320 | 1.95 |
Question:
On what air date were there 2.15 million u.s. viewers?
Answer:
February1,2010