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 | Air Date | Timeslot | 18-49 | Viewers |
| --- | --- | --- | --- | --- |
| Gary Has a Dream | September 23, 2009 | Wednesday 8:30 pm | 2.4/7 | 7.37 |
| Gary Promises Too Much | September 30, 2009 | Wednesday 8:30 pm | 2.3/7 | 7.08 |
| Gary's Demo | October 7, 2009 | Wednesday 8:30 pm | 2.2/6 | 7.17 |
| Gary Shoots Fish in a Barrel | October 14, 2009 | Wednesday 8:30 pm | 2.4/7 | 7.38 |
| Gary on the Air | October 21, 2009 | Wednesday 8:30 pm | 2.2/6 | 6.76 |
| Gary Tries to Do It All | November 4, 2009 | Wednesday 8:30 pm | 2.0/5 | 6.29 |
| Gary and Allison's Friend | November 11, 2009 | Wednesday 8:30 pm | 2.4/6 | 7.3 |
| Gary Apologizes | November 18, 2009 | Wednesday 8:30 pm | 2.4/7 | 7.0 |
| Gary Keeps a Secret | November 25, 2009 | Wednesday 8:30 pm | 1.8/6 | 6.68 |
| Gary Gives Sasha His Full Attention | December 9, 2009 | Wednesday 8:30 pm | 2.3/6 | 7.01 |
| Gary Is a Boat Guy | December 16, 2009 | Wednesday 8:30 pm | 2.5/7 | 7.76 |
| Gary Feels Tom Slipping Away | January 13, 2010 | Wednesday 8:30 pm | 1.9/5 | 5.59 |
| Gary Has to Choose | January 20, 2010 | Wednesday 8:30 pm | 1.8/5 | 5.89 |
| Gary Lowers the Bar | February 10, 2010 | Wednesday 8:30 pm | 2.4/7 | 7.49 |
| Gary's Big Mouth | March 4, 2010 | Wednesday 8:30 pm | 2.0/5 | 6.02 |
| Gary Tries to Find Something for Mitch | March 10, 2010 | Wednesday 8:30 pm | 2.2/7 | 6.83 |
| Gary Unmarried? | March 17, 2010 | Wednesday 8:30 pm | 1.8/5 | 5.7 |
Question:
What is the highest number of viewers for the episode that has an 18-49 of 1.8/6?
Answer:
6.68