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) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 20.0 | 1.0 | "Beggin' on Your Knees" | Steve Hoefer | Jake Farrow | April2,2011 | 209 | 6.2 |
| 21.0 | 2.0 | "Beck Falls for Tori" | Steve Hoefer | Dan Schneider | April16,2011 | 201 | 3.9 |
| 22.0 | 3.0 | "Ice Cream for Ke$ha" | Adam Weissman | Arthur Gradstein | April22,2011 | 210 | 4.0 |
| 23.0 | 4.0 | "Tori Gets Stuck" | Russ Reinsel | Jake Farrow | May14,2011 | 205 | 4.2 |
| 24.0 | 5.0 | "Prom Wrecker" | Adam Weissman | Matt Fleckenstein | May21,2011 | 211 | 3.6 |
| 25.0 | 6.0 | "Locked Up!" | Steve Hoefer | Dan Schneider | July30,2011 | 203–204 | 5.2 |
| 26.0 | 7.0 | "Helen Back Again" | Russ Reinsel | Arthur Gradstein | September10,2011 | 202 | 4.4 |
| 27.0 | 8.0 | "Who Did It to Trina?" | Adam Weissman | Dan Schneider | September17,2011 | 208 | 4.7 |
| 28.0 | 9.0 | "Tori Tortures Teacher" | Russ Reinsel | Matt Fleckenstein | October1,2011 | 206 | 3.8 |
| 29.0 | 10.0 | "Jade Gets Crushed" | Clayton Boen | Dan Schneider | October8,2011 | 207 | 3.4 |
| 30.0 | 11.0 | "Terror on Cupcake Street" | Steve Hoefer | Dan Schneider | October15,2011 | 212 | 3.4 |
Question:
How many millions of US viewers watched "Helen Back Again"?
Answer:
4.4