Hoping to maintain their winning streak the Ravens flew to Paul Brown Stadium for an AFC North rivalry match against the Bengals. In the 2nd quarter Baltimore trailed early as kicker Mike Nugent hit a 36 and a 30-yard field goal. In the third quarter the Ravens replied and took the lead with QB Joe Flacco completing a 31-yard TD pass to WR Derrick Mason. The Bengals replied when Nugent hit a 46-yard field goal. The Ravens took the lead back in the fourth quarter when kicker Billy Cundiff got a 38-yard field goal, but it was cut off by Nugent's 38 and 25-yard field goal, giving Baltimore a loss.

Based on the above article, answer a question. How many yards difference exists between Mike Nugent's longest and shortest field goal?
21