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:
| # | Airdate | No. of couples | First couple | Second couple | Third couple | Fourth couple | Viewers (millions) | ITV1 weekly ranking |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 2 January 2010 | 3.0 | Jim and Caroline | N/A | Rob and Jo-Jo | Adam and Charlene | 3.87 | 22.0 |
| 2.0 | 9 January 2010 | 3.0 | Joel (n/a) | Ibrahim and Maria | Alan and Lia-Jay | Oliver and Louisa | 4.72 | 29.0 |
| 3.0 | 16 January 2010 | 4.0 | Adam and Nicola | David and Georgee | Oliver and June | Tony and Jamie | 4.74 | 18.0 |
| 4.0 | 23 January 2010 | 4.0 | Tom and Cally | James and Emmaline | Boyd and Lindsey | Stefano and Joanne | 4.92 | 20.0 |
| 5.0 | 30 January 2010 | 3.0 | Jamie and Kelly | N/A | Stefan and Becka | James and Laura | 4.87 | 20.0 |
| 6.0 | 6 February 2010 | 3.0 | Jonathan and Helen | Nathan and Shakira | N/A | Darren and Josephine | 5.42 | 19.0 |
| 7.0 | 13 February 2010 | 3.0 | Arton and Crystal | James and Claire-Louise | N/A | Sammy and Nat | 4.71 | 19.0 |
Question:
What is the minimum ITV1 ranking for the episode having viewership of 5.42 million?
Answer:
19.0