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 season | No. in series | Title | Directed by | Written by | Original air date | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 105.0 | "Ashes to Ashes" | Kevin Dowling | James Stanley | March 10, 2013 | 2.38 |
| 2.0 | 106.0 | "From the Ashes" | Kevin Dowling | Linda Gase | March 17, 2013 | 2.27 |
| 3.0 | 107.0 | "Blowback" | Chris Peppe | Bill Rinier | March 24, 2013 | 2.45 |
| 4.0 | 108.0 | "Hearth and Home" | John T. Kretchmer | Karen Maser | March 31, 2013 | 2.12 |
| 5.0 | 109.0 | "Disarmament" | Brian McNamara | T.J. Brady & Rasheed Newson | April 7, 2013 | 2.60 |
| 6.0 | 110.0 | "Losing Battles" | James Bruce | Marlana Hope | April 14, 2013 | 2.66 |
| 7.0 | 111.0 | "Brace for Impact" | John T. Kretchmer | Rob Forman | April 21, 2013 | 2.58 |
| 8.0 | 112.0 | "Jackpot" | Christine Moore | Lynelle White | April 28, 2013 | 2.76 |
| 9.0 | 113.0 | "Blood and Treasure" | Kelli Williams | James Stanley | May 5, 2013 | 2.73 |
| 10.0 | 114.0 | "Reckoning" | Brian McNamara | T.J. Brady & Rasheed Newson | May 12, 2013 | 2.31 |
| 11.0 | 115.0 | "Adjustment Period" | Debbie Allen | Karen Maser | May 19, 2013 | 2.58 |
| 12.0 | 116.0 | "Damaged" | James Bruce | Marlana Hope & Bill Rinier | June 2, 2013 | 2.84 |
Question:
How many millions of U.S. viewers watched the episode that first aired on March 31, 2013?
Answer:
2.12