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:
| Episode # | Series # | Episode Title | Original air date | Production Code |
| --- | --- | --- | --- | --- |
| 53.0 | 1.0 | "Stars in Danger" | 5July2010 | 301.0 |
| 54.0 | 2.0 | "The Break-up" | 6July2010 | 302.0 |
| 55.0 | 3.0 | "Welcome to Paradisia" | 7July2010 | 303.0 |
| 56.0 | 4.0 | "A New Strategy" | 8July2010 | 304.0 |
| 57.0 | 5.0 | "Resonance" | 4September2010 | 305.0 |
| 58.0 | 6.0 | "May the Show Begin!" | 11September2010 | 306.0 |
| 59.0 | 7.0 | "Fathers and Sons" | 18September2010 | 307.0 |
| 60.0 | 8.0 | "The Other Side of Paradisia" | 25September2010 | 308.0 |
| 61.0 | 9.0 | "The Secret of Deep Stadium" | 10October2011 | 309.0 |
| 62.0 | 10.0 | "Friends and Enemies" | 11October2011 | 310.0 |
| 63.0 | 11.0 | "Battle for the Final" | 12October2011 | 311.0 |
| 64.0 | 12.0 | "Betrayal on the Field" | 13October2011 | 312.0 |
| 65.0 | 13.0 | "Endgame" | 14October2011 | 313.0 |
| 66.0 | 14.0 | "A New Start" | 15October2011 | 314.0 |
| 67.0 | 15.0 | "Crossed Fates" | 16October2011 | 315.0 |
| 68.0 | 16.0 | "The Secrets of the Breath" | 17October2011 | 316.0 |
| 69.0 | 17.0 | "Reconstituted Families" | 18October2011 | 317.0 |
| 70.0 | 18.0 | "Sinedd’s Shadow" | 19October2011 | 318.0 |
| 71.0 | 19.0 | "The Ghost of Paradisia" | 20October2011 | 319.0 |
| 72.0 | 20.0 | "Walk for a Pirate" | 21October2011 | 320.0 |
| 73.0 | 21.0 | "Farewell, Paradisia" | 22October2011 | 321.0 |
| 74.0 | 22.0 | "All Together!" | 23October2011 | 322.0 |
| 75.0 | 23.0 | "Lost Illusions" | 24October2011 | 323.0 |
| 76.0 | 24.0 | "The Second Chance" | 25October2011 | 324.0 |
| 77.0 | 25.0 | "On all Fronts" | 26October2011 | 325.0 |
Question:
When "the secret of deep stadium" is the episode title what is the lowest series number?
Answer:
9.0