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 | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- |
| 37.0 | 1.0 | "Living the Dream" | Marcos Siega | Clyde Phillips | September27,2009 | 1.9 |
| 38.0 | 2.0 | "Remains to Be Seen" | Brian Kirk | Charles H. Eglee | October4,2009 | 1.3 |
| 39.0 | 3.0 | "Blinded by the Light" | Marcos Siega | Scott Buck | October11,2009 | N/A |
| 40.0 | 4.0 | "Dex Takes a Holiday" | John Dahl | Melissa Rosenberg & Wendy West | October18,2009 | N/A |
| 41.0 | 5.0 | "Dirty Harry" | Keith Gordon | Tim Schlattmann | October25,2009 | 1.7 |
| 42.0 | 6.0 | "If I Had a Hammer" | Romeo Tirone | Lauren Gussis | November1,2009 | 1.87 |
| 43.0 | 7.0 | "Slack Tide" | Tim Hunter | Scott Buck | November8,2009 | N/A |
| 44.0 | 8.0 | "Road Kill" | Ernest Dickerson | Melissa Rosenberg & Scott Reynolds | November15,2009 | 1.69 |
| 45.0 | 9.0 | "Hungry Man" | John Dahl | Wendy West | November22,2009 | 1.76 |
| 46.0 | 10.0 | "Lost Boys" | Keith Gordon | Charles H. Eglee & Tim Schlattmann | November29,2009 | N/A |
Question:
What in the series number of the episode written by Lauren Gussis?
Answer:
42.0