The Browns opened their 2013 season at home against the Dolphins.  The Dolphins struck first in the first quarter when Caleb Sturgis kicked a 45-yard field goal for a 3-0 lead.  They increased their lead in the 2nd quarter when Sturgis nailed a 49-yard field goal for a 6-0 lead.  The Browns got on the board and took the halftime lead 7-6 after Jordan Cameron caught a 7-yard TD pass from Brandon Weeden.  The Dolphins retook the lead in the 3rd quarter when Brian Hartline caught a 34-yard TD pass from Ryan Tannehill to make the score 13-7.  The Browns came within 3 as Billy Cundiff kicked a 39-yard field goal for a 13-10 game.  In the 4th quarter, the Phins sealed the game as Daniel Thomas ran for a 1-yard TD for a 20-10 game followed up by Sturgis kicking a 36-yard field goal. With the loss, the Browns start the season 0-1 and pick up their 9th straight regular season opening loss.
Question: How many points were scored in the first half?
Answer: 13