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. disc | Title | Directed by | Written by | Original air date |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 1.0 | " Redemption " | Martin Wood | Robert C. Cooper | June7,2002 ( Sci Fi Channel ) |
| 2.0 | 1.0 | " Redemption (Part 2) " | Martin Wood | Robert C. Cooper | June14,2002 (Sci Fi Channel) |
| 3.0 | 1.0 | "Descent" | Peter DeLuise | Joseph Mallozzi & Paul Mullie | June21,2002 (Sci Fi Channel) |
| 4.0 | 1.0 | "Frozen" | Martin Wood | Robert C. Cooper | June28,2002 (Sci Fi Channel) |
| 5.0 | 2.0 | "Nightwalkers" | Peter DeLuise | Joseph Mallozzi & Paul Mullie | July12,2002 (Sci Fi Channel) |
| 6.0 | 2.0 | "Abyss" | Martin Wood | Brad Wright | July19,2002 (Sci Fi Channel) |
| 7.0 | 2.0 | "Shadow Play" | Peter DeLuise | Joseph Mallozzi & Paul Mullie | July26,2002 (Sci Fi Channel) |
| 8.0 | 2.0 | "The Other Guys" | Martin Wood | Damian Kindler | August2,2002 (Sci Fi Channel) |
| 9.0 | 3.0 | "Allegiance" | Peter DeLuise | Peter DeLuise | August9,2002 (Sci Fi Channel) |
| 10.0 | 3.0 | "Cure" | Andy Mikita | Damian Kindler | August16,2002 (Sci Fi Channel) |
| 11.0 | 3.0 | "Prometheus (1)" | Peter F. Woeste | Joseph Mallozzi & Paul Mullie | August23,2002 (Sci Fi Channel) |
| 13.0 | 4.0 | "Sight Unseen" | Peter F. Woeste | Ron Wilkerson | December11,2002 (Sky One) |
| 14.0 | 4.0 | "Smoke & Mirrors" | Peter DeLuise | Katharyn Powers | December18,2002 (Sky One) |
| 15.0 | 4.0 | "Paradise Lost" | William Gereghty | Robert C. Cooper | January8,2003 (Sky One) |
| 16.0 | 4.0 | "Metamorphosis" | Peter DeLuise | Jacqueline Samuda & James Tichenor | January15,2003 (Sky One) |
| 17.0 | 4.0 | "Disclosure" | William Gereghty | Joseph Mallozzi & Paul Mullie | January22,2003 (Sky One) |
| 18.0 | 5.0 | "Forsaken" | Andy Mikita | Damian Kindler | January29,2003 (Sky One) |
| 20.0 | 5.0 | "Memento" | Peter DeLuise | Damian Kindler | February12,2003 (Sky One) |
| 21.0 | 5.0 | "Prophecy" | Will Waring | Joseph Mallozzi & Paul Mullie | February19,2003 (Sky One) |
Question:
Which number episode of season 6 was the title "Sight Unseen"?
Answer:
13.0