Coming off of their bye week, the Rams flew to Qualcomm Stadium for their Week 8 match-up with the San Diego Chargers.  From the get-go, St. Louis trailed as RB LaDainian Tomlinson got a 2-yard TD run and a 38-yard TD run in the first quarter.  In the second quarter, the Rams started to retaliate as RB Steven Jackson got a 3-yard TD run for the only score of the period.  In the third quarter, things started to get ugly for St. Louis as Chargers free safety Marlon McCree returned a fumble 79 yards for a touchdown. The Rams responded with kicker Jeff Wilkins nailing a 34-yard field goal, yet Chargers kicker Nate Kaeding made a 31-yard field goal. In the fourth quarter, it was back and forth with touchdowns.  San Diego RB Michael Turner got a 14-yard TD run, while Rams QB Marc Bulger completed a 7-yard TD pass to WR Shaun McDonald.  Afterwards, Chargers QB Philip Rivers completed a 25-yard TD pass to Tomlinson, while Bulger completed a 6-yard TD pass to WR Kevin Curtis. However, San Diego got the win, as St. Louis fell to 4-3.
Question: How many yards long was the average length of touchdowns scored in the fourth quarter?
Answer: 13