Hoping to rebound from their road loss to the Steelers, the Bengals went home for a Week 13 AFC North rematch with the Baltimore Ravens.  In the first quarter, Cincinnati trailed early as Ravens kicker Matt Stover made a 27-yard field goal.  In the second quarter, Baltimore increased its lead as Stover got a 21-yard field goal, along with QB Joe Flacco completing a 4-yard TD pass to TE Todd Heap.  The Bengals would close out the half as kicker Shayne Graham nailed a 21-yard field goal. In the third quarter, the Ravens pulled away as WR Mark Clayton completed a 32-yard TD pass to WR Derrick Mason and caught a 70-yard TD pass from Flacco.  In the fourth quarter, Baltimore pulled away as safety Jim Leonhard returned an interception 35 yards for a touchdown. With the loss, not only did Cincinnati fall to 1-10-1.  They surpassed their 2007 loss total and were swept by the Ravens for the first time since 2002.
Question: How many more field goals were kicked in the first half than the second?
Answer: 3