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. | # | Title | Directed by | Written by | U.S. air date | Production code | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 45.0 | 1.0 | " Exile" | Greg Beeman | Alfred Gough & Miles Millar | October1,2003 | 176201.0 | 6.80 |
| 46.0 | 2.0 | " Phoenix" | James Marshall | Kelly Souders & Brian Peterson | October8,2003 | 176202.0 | 6.70 |
| 47.0 | 3.0 | " Extinction" | Michael Katleman | Todd Slavkin & Darren Swimmer | October15,2003 | 176203.0 | 6.50 |
| 48.0 | 4.0 | " Slumber" | Daniel Attias | Drew Z. Greenberg | October22,2003 | 176204.0 | 6.90 |
| 49.0 | 5.0 | " Perry" | Jeannot Szwarc | Mark Verheiden | October29,2003 | 176205.0 | 6.70 |
| 50.0 | 6.0 | " Relic" | Marita Grabiak | Kelly Souders & Brian Peterson | November5,2003 | 176206.0 | 6.70 |
| 51.0 | 7.0 | " Magnetic" | David Jackson | Holly Harold | November12,2003 | 176207.0 | 6.90 |
| 52.0 | 8.0 | " Shattered" | Ken Biller | Ken Biller | November19,2003 | 176208.0 | 6.40 |
| 53.0 | 9.0 | " Asylum" | Greg Beeman | Todd Slavkin & Darren Swimmer | January14,2004 | 176209.0 | 5.60 |
| 54.0 | 10.0 | " Whisper" | Tom Wright | Ken Horton | January21,2004 | 176210.0 | 5.10 |
| 55.0 | 11.0 | " Delete" | Pat Williams | Kelly Souders & Brian Peterson | January28,2004 | 176211.0 | 5.50 |
| 56.0 | 12.0 | " Hereafter" | Greg Beeman & James Marshall | Mark Verheiden & Drew Greenberg | February4,2004 | 176212.0 | 5.30 |
| 57.0 | 13.0 | " Velocity" | Jeannot Szwarc | Todd Slavkin & Darren Swimmer | February11,2004 | 176213.0 | 5.00 |
| 58.0 | 14.0 | " Obsession" | James Marshall | Holly Harold | February18,2004 | 176214.0 | 5.33 |
| 59.0 | 15.0 | " Resurrection" | Terrence O'Hara | Todd Slavkin & Darren Swimmer | February25,2004 | 176215.0 | 4.97 |
| 60.0 | 16.0 | " Crisis" | Ken Biller | Kelly Souders & Brian Peterson | March3,2004 | 176216.0 | 5.26 |
| 61.0 | 17.0 | " Legacy" | Greg Beeman | Jeph Loeb | April14,2004 | 176217.0 | 4.48 |
| 62.0 | 18.0 | " Truth" | James Marshall | Drew Greenberg | April21,2004 | 176218.0 | 4.43 |
| 63.0 | 19.0 | " Memoria" | Miles Millar | Alfred Gough & Miles Millar | April28,2004 | 176219.0 | 4.32 |
| 64.0 | 20.0 | " Talisman" | John Schneider | Ken Biller | May5,2004 | 176220.0 | 4.72 |
| 65.0 | 21.0 | " Forsaken" | Terrence O'Hara | Kelly Souders & Brian Peterson | May12,2004 | 176221.0 | 4.54 |
Question:
what is the number of the episode in the season that had 5.60 millions of north american spectors?
Answer:
53.0